Put a po’boy next to a submarine sandwich and nobody needs a culinary degree to notice the family resemblance.
Both are long.
Both begin with split bread.
Both can contain meat, cheese, vegetables, sauces, or fried foods.
Both can become large enough that eating one neatly turns into an unrealistic goal.
For that reason, dictionaries often place po’boy, submarine, hoagie, hero, grinder, and similar names within the same broad American long-sandwich category. Merriam-Webster defines a submarine as a large sandwich on a long split roll with a wide range of possible fillings and lists po’boy among the regional names associated with that family.
That comparison is useful.
It is not the whole answer.
A po’boy can reasonably be described as Louisiana’s distinctive regional member of the long-roll sandwich family, but calling it simply another word for submarine sandwich erases the bread, history, fillings, and ordering language that make the New Orleans sandwich its own tradition.
A sub describes a broad shape and sandwich format.
A po’boy carries New Orleans with it.
At the Broadest Level, They Are Related
A submarine sandwich is generally a large sandwich served on a long split roll and filled with almost anything from cold cuts and cheese to meatballs, vegetables, and condiments. The same broad form appears around the United States under regional names including sub, hero, hoagie, grinder, torpedo, and Italian sandwich.
The po’boy clearly belongs somewhere in that extended family.
It uses a long loaf.
It is split and filled.
It can contain cold meat, hot meat, cheese, seafood, vegetables, or even French fries.
64 Parishes goes so far as to call the po’boy the Gulf Coast counterpart to the submarine sandwich, while still treating it as a distinctive expression of New Orleans food culture.
That is probably the best starting point.
Related does not mean identical.
The Biggest Difference Is the Bread
A generic submarine sandwich can be served on many kinds of long rolls.
The traditional po’boy is much more demanding.
New Orleans-style French bread is lighter and less dense than a traditional baguette and has a thinner, crisp crust surrounding an airy interior. Southern Foodways Alliance argues that if anything defines the po’boy, it is the bread that gives the sandwich its form.
That bread changes how the sandwich eats.
The exterior cracks.
The inside compresses.
Roast beef gravy soaks into the open crumb.
Fried shrimp and oysters can sit inside a substantial loaf without being overwhelmed by dense bread.
An ordinary sub roll may be excellent.
It does not necessarily behave that way.
Po’boy Bread Is Lighter Than It Looks
A traditional po’boy loaf can appear enormous.
Then someone picks it up and discovers that much of the interior is air.
That is intentional.
The open crumb leaves enough bread to contain the filling without making each bite primarily about bread. The thin outer crust supplies texture while the softer center molds itself around irregular foods such as fried oysters, shrimp, sausage links, or falling-apart roast beef.
A typical submarine roll can range from very soft to dense and chewy depending on the region and bakery.
There is no universal sub bread.
The po’boy tradition has a much clearer bread ideal.
A Hard Baguette Is Not the Same Thing Either
Because New Orleans calls its loaf French bread, people sometimes assume a proper po’boy belongs on a classic French baguette.
Not quite.
New Orleans French bread developed into a lighter local style with a thinner crust than a conventional baguette.
That difference matters once the sandwich is filled.
A chewy baguette can push fried seafood out the opposite end when someone bites down.
Traditional po’boy bread gives way more readily.
The goal is not to prove the bread can defeat the customer.
It is to get the shrimp into their mouth.
The Po’boy Has a Specific New Orleans Origin Story
The submarine sandwich is a broad American sandwich category whose regional terminology varies widely.
The po’boy has a much more specific local history.
The modern poor boy name traces to the 1929 New Orleans streetcar strike, when former streetcar conductors Benny and Clovis Martin offered free meals to striking transit workers at their French Market restaurant. The brothers also worked with baker John Gendusa to create a longer, more uniform loaf that could be divided efficiently into large sandwiches for the strikers.
The name spread.
Poor boy eventually became po’boy.
That history is not decorative trivia.
It is part of what separates the sandwich from a generic long roll filled with lunch meat.
The Po’boy Loaf Was Designed Around Feeding People
The bread innovation associated with the Martin Brothers and John Gendusa was practical.
Older loaves tended to bulge through the center and taper at the ends. The special poor-boy loaf was long and relatively uniform, allowing restaurants to cut large sandwiches with more consistent portions and less waste.
That original loaf was reportedly around forty inches long.
It was not one giant individual sandwich.
It was a bread delivery system capable of becoming several sandwiches.
The shape of the modern po’boy therefore came partly from a labor dispute and partly from restaurant logistics.
The sandwich was designed for feeding people efficiently.
A Sub Does Not Carry One Equivalent Origin Story
That does not make submarine sandwiches historically uninteresting.
It means submarine sandwich functions more as a broad American category than as one narrowly rooted civic dish.
Even modern dictionaries treat submarine, hero, hoagie, grinder, torpedo, Italian sandwich, and po’boy as overlapping regional terms for long sandwiches.
Different places developed their own customs within that family.
Philadelphia has the hoagie.
Parts of New England use grinder.
New York is strongly associated with hero.
New Orleans has the po’boy.
Those names can describe similar architecture without making the sandwiches culturally interchangeable.
Cold Cuts Are Central to Many Subs
Picture the stereotypical American submarine sandwich and something like this may appear:
Salami.
Ham.
Turkey.
Provolone.
Lettuce.
Tomato.
Onion.
Oil and vinegar.
Maybe peppers.
Maybe mayonnaise.
That is only one style of submarine sandwich, and subs can certainly be hot or filled with meatballs, steak, chicken, tuna, vegetables, and many other foods. Merriam-Webster’s definition intentionally leaves the filling open-ended.
Still, layered deli meats and cheeses occupy a much more central place in the popular image of a sub than they do in classic po’boy culture.
New Orleans starts imagining different things.
Roast Beef and Gravy Are Foundational Po’boy Foods
A classic New Orleans roast beef po’boy is almost the opposite of a tidy Italian cold-cut sub.
The beef is hot.
It may be sliced, shredded, or falling apart.
Gravy enters the bread.
Debris—the small beef fragments that break down into the cooking juices—can make the sandwich even wetter.
Roast beef was not a late addition to the po’boy tradition. The Martin Brothers became especially known for roast beef poor boys and eventually handled enough beef to employ their own butchers.
That gravy-soaked meat became one of the foundational po’boy styles.
A generic submarine sandwich can contain roast beef.
A New Orleans roast beef po’boy comes with an entire local gravy tradition attached.
Fried Seafood Is Another Major Divide
Fried seafood has become equally central to modern po’boy identity.
Shrimp.
Oysters.
Catfish.
Soft-shell crab.
All belong comfortably inside the New Orleans loaf. 64 Parishes identifies these among the broad range of fillings that turned the po’boy into one of the city’s most flexible foods.
New Orleans tourism guidance still presents fried shrimp, oysters, catfish, soft-shell crab, and roast beef as core po’boy choices.
You can certainly put fried seafood into another kind of long roll and call it a sandwich.
Louisiana has a very specific word waiting for it when the proper bread and tradition are involved.
Hot Sausage Adds Another New Orleans Category
Article 251 looked at the hot sausage po’boy.
That sandwich again demonstrates why filling alone cannot define the po’boy.
Fresh, peppery New Orleans-style hot sausage has almost nothing in common with fried oysters or gravy-soaked roast beef.
Yet all three become recognizable po’boys because they enter the same bread-and-sandwich tradition.
A submarine shop elsewhere might serve sausage.
The New Orleans hot sausage po’boy carries its own Creole meat history.
The long bread provides the common structure.
Local food culture supplies the personality.
Ham and Cheese Can Be a Po’boy Too
This is important because it prevents us from making the po’boy sound more exotic than it really is.
Ham and cheese is an established po’boy filling. So are fried eggplant and French fries.
A po’boy does not require Gulf seafood.
It does not require gravy.
It does not require something a visitor considers unusual.
Sometimes lunch is ham and cheese on the correct bread.
That may look very similar to a submarine sandwich.
Context still matters.
The Difference Is Not a List of Allowed Fillings
Trying to distinguish po’boys and subs by creating two ingredient lists will fail.
A sub can contain roast beef.
A po’boy can contain ham.
Both can have cheese.
Both can contain lettuce and tomato.
Both can use mayonnaise.
The difference emerges from the combination of:
Bread.
Regional history.
Restaurant tradition.
Ordering vocabulary.
Typical fillings.
And cultural expectation.
It is a pattern rather than one mandatory ingredient.
“Dressed” Is a Particularly New Orleans Clue
Order a po’boy dressed in New Orleans and the usual meaning is lettuce, tomato, pickles, and mayonnaise. Current New Orleans guidance continues to use those toppings as the standard dressed-po’boy vocabulary.
That phrase is part of the sandwich’s local grammar.
Other American sandwich regions have their own shorthand.
A submarine shop may offer “the works,” an Italian-style dressing, oil and vinegar, peppers, onions, or a house combination.
Those conventions differ by city and shop.
In New Orleans, someone asking whether you want it dressed has already told you what type of sandwich counter you are standing at.
A Dressed Po’boy Does Not Mean Every Possible Topping
This is another difference between local vocabulary and generic sandwich customization.
“Dressed” is not simply shorthand for put everything in the refrigerator on it.
The standard combination centers on lettuce, tomato, pickles, and mayonnaise. Individual shops and customers may add mustard, hot sauce, ketchup, onions, cheese, or other ingredients.
The term gives the order a baseline.
Then New Orleans starts negotiating.
A sub shop may achieve a very similar finished sandwich using different words.
Language is part of regional food.
The Po’boy Is More Closely Tied to One City
Submarine sandwiches are national.
Their names shift regionally, but the long-roll sandwich itself appears almost everywhere in the United States.
The po’boy spread beyond New Orleans through Louisiana and the Gulf Coast, yet its identity remains strongly anchored to New Orleans. 64 Parishes calls the sandwich bedrock New Orleans culinary culture and traces its expansion outward from the city after the 1929 strike.
That relationship is similar to other regional foods that can be made elsewhere without losing their geographical association.
A cheesesteak can be made in Louisiana.
Philadelphia still matters to the story.
A po’boy can be made in Texas.
New Orleans still matters to that story.
Dictionaries Can Call Them Synonyms Without Ending the Discussion
This is where dictionary definitions and food culture perform different jobs.
Merriam-Webster lists po’boy among the synonymous regional names for submarine sandwich and even defines submarine sandwich by reference to poor boy.
That is useful if someone asks what basic kind of object a po’boy is.
It is a long filled sandwich.
But a dictionary synonym does not mean two regional food traditions are identical in every detail.
Hoagie and grinder can also appear as dictionary synonyms while residents of Philadelphia, New England, or New York may attach very specific expectations to each.
Language groups the sandwiches together.
Food culture separates them again.
Think Family Rather Than Clone
The easiest way to understand the relationship is through a family analogy.
A po’boy and submarine sandwich are relatives.
Not clones.
They share the long-roll structure that also connects hoagies, heroes, grinders, and torpedoes.
But each region can build identity around a particular bread, filling tradition, condiment vocabulary, and history.
New Orleans did exactly that.
Its version became distinctive enough that locals recognize a proper po’boy as something more specific than any sandwich shaped vaguely like a submarine.
A Hoagie Provides a Good Comparison
Merriam-Webster defines a hoagie as another regional form of submarine sandwich and notes its particularly strong association with Philadelphia and surrounding areas.
That helps show why the terminology works the way it does.
Calling a hoagie a submarine sandwich is broadly understandable.
Calling every long sandwich in Philadelphia simply a generic sub can still miss local expectations.
The po’boy works similarly.
At the national-category level:
Long sandwich.
At the regional level:
Much more specific.
A Po’boy Is Not Defined by Italian-American Deli Tradition
Many well-known submarine and hoagie traditions have strong Italian-American connections, particularly versions built around salami, capicola, mortadella, provolone, peppers, oil, and vinegar.
New Orleans certainly has major Italian and Sicilian food traditions of its own.
The city’s muffuletta represents those influences far more directly than the po’boy does.
The po’boy instead became a broad New Orleans working-class sandwich capable of carrying meat, seafood, sausage, vegetables, and inexpensive fillings such as French fries.
That breadth is one of its defining features.
The sandwich absorbs New Orleans rather than one deli tradition.
A Muffuletta Is Actually a Better New Orleans Counterexample
New Orleans contains both po’boys and muffulettas.
That is useful because it proves the city itself distinguishes between different sandwich traditions.
The muffuletta uses a broad round Sicilian-style loaf and is associated with Italian meats, cheese, and olive salad. 64 Parishes notes that New Orleans once even explained the unfamiliar muffuletta to readers by comparing it with an “Italian poor boy,” showing how dominant the po’boy had become as the city’s sandwich vocabulary.
Different loaf.
Different filling tradition.
Different identity.
The city did not simply call every substantial sandwich a po’boy.
Bread Can Change the Name
Article 250 gave another excellent example.
Casamento’s famous oyster loaf uses a different bread tradition from the standard po’boy.
Same city.
Fried oysters.
Bread.
Yet the sandwich retains the older oyster loaf identity.
That reinforces the larger point.
New Orleans takes bread seriously enough that changing it can change what the sandwich is called.
A generic submarine definition does not capture that level of local detail.
Vietnamese Bread Complicates the Boundary in an Interesting Way
New Orleans’s Vietnamese community introduced another French-bread sandwich tradition through bánh mì.
Southern Foodways Alliance documents modern po’boy makers such as Killer Poboys intentionally using Vietnamese French bread rather than traditional New Orleans po’boy loaves, stretching the conventional definition while remaining part of contemporary New Orleans sandwich culture.
That proves the po’boy category is not frozen.
Bread matters enormously.
Tradition can still evolve.
The boundary is cultural, not a legal specification measured by bread inspectors.
Can You Make a Po’boy on a Sub Roll?
You can make a sandwich using po’boy fillings on a generic sub roll.
Whether a New Orleanian considers it a proper po’boy is another question.
Put fried shrimp, lettuce, tomato, pickles, and mayonnaise on a soft commercial submarine roll and much of the flavor may still be excellent.
But one of the defining elements has changed.
Southern Foodways Alliance’s description is worth returning to: if anything defines the po’boy, it is the bread.
That does not mean the sandwich becomes inedible outside New Orleans.
It means authenticity is more complicated than copying the filling.
Can a Sub Use New Orleans French Bread?
Of course.
A long loaf is versatile.
Cold cuts, cheese, meatballs, grilled vegetables, chicken, and countless other fillings can go onto New Orleans French bread.
Whether the resulting sandwich is called a po’boy depends partly on where it is being sold and how the restaurant understands its menu.
A ham-and-cheese sandwich on po’boy bread in New Orleans can comfortably be a po’boy.
The same bread filled with an Italian deli stack at a restaurant that deliberately calls it a sub may remain a sub.
Food names depend on cultural context as much as geometry.
Po’boys Are Often Hotter and Messier, but That Is Not a Rule
Classic po’boys frequently emphasize hot fillings.
Fried shrimp arrive from the fryer.
Oysters are hot.
Roast beef carries warm gravy.
Hot sausage comes from the griddle.
By contrast, many familiar sub sandwiches are cold-cut combinations.
That makes hot versus cold a useful general impression but a poor definition.
Po’boys can contain cold ham and cheese.
Subs can contain hot meatballs or cheesesteak-style fillings.
The distinction helps describe tendencies.
It cannot police the category.
Gravy Is One of the Po’boy’s Great Advantages
A generic sandwich roll may tolerate gravy.
New Orleans French bread seems to have trained for it.
The airy interior absorbs roast juices, while the crisp crust initially gives the sandwich enough structure to remain handheld.
That is why roast beef and debris po’boys can become almost saturated while still functioning as sandwiches.
Few iconic submarine sandwiches make wet beef gravy quite so central to their identity.
The po’boy did.
New Orleans looked at handheld food and decided it had been staying too clean.
Fried Seafood Creates a Different Kind of Po’boy Mess
A shrimp or oyster po’boy is usually less gravied than roast beef but comes with its own structural problems.
Breading falls.
French-bread crust flakes.
Lettuce escapes.
A shrimp occasionally makes a bid for freedom.
The thin po’boy crust and compressible crumb help contain those irregular fillings better than an aggressively chewy loaf would.
This relationship between bread and filling is one of the reasons the sandwich feels regionally engineered rather than arbitrary.
The Po’boy Has Stronger Working-Class Historical Associations
Many American long sandwiches became associated with workers because they were portable, inexpensive, and filling.
The po’boy has an especially explicit connection.
Its modern name emerged while the Martin Brothers were feeding striking streetcar workers in 1929. The sandwiches were designed to provide substantial inexpensive meals to laborers and their families during a bitter strike.
That history remained embedded in the name.
A submarine sandwich may also be working food.
The po’boy has the labor dispute written directly into its biography.
The Name “Poor Boy” Carries History a Generic “Sub” Does Not
Originally, New Orleans menus commonly used poor boy rather than today’s contracted spelling.
64 Parishes notes that newspapers and restaurant menus began using the term in the early 1930s, and the full spelling remained common for decades before po’boy or po-boy became predominant.
That evolution says something about the sandwich’s depth in local speech.
The name moved from historical description into everyday dialect.
Submarine, by contrast, is generally understood as a shape metaphor: a long sandwich resembling the profile of a submarine.
One name describes shape.
The other remembers people.
Does a Po’boy Have to Be Made in New Orleans?
No.
Louisiana restaurants outside the city make po’boys every day.
The sandwich spread through the state and much of the Gulf Coast after its New Orleans emergence.
The farther it travels, however, the bread can become the biggest challenge.
Fresh New Orleans-style loaves are unusually important to the finished sandwich. Restaurants with access to Louisiana bakery distribution can stay close to the traditional texture, while others may substitute whatever long bread is locally available.
The sandwich can travel.
Its easiest authenticity test tends to travel by bread truck.
Does Every New Orleans Po’boy Follow the Old Rules?
Definitely not.
Modern chefs experiment with fillings and bread.
Killer Poboys, for example, deliberately uses Vietnamese French bread and customized garnishes rather than following the traditional New Orleans loaf-and-dressed-topping format. Southern Foodways Alliance describes the restaurant as stretching the po’boy definition while remaining firmly rooted in a city where po’boys are simply the natural sandwich form.
That evolution matters.
A living regional food should be able to change without losing its history.
Tradition establishes the reference point.
Chefs decide how far they want to move from it.
A Sub Can Be Excellent Without Being a Po’boy
None of this requires ranking the sandwiches.
A great Italian sub can be extraordinary.
A meatball submarine can be excellent.
A Philadelphia hoagie has its own regional logic.
A grinder from New England should be judged within its own tradition.
The point is not that po’boys are somehow superior because Louisiana named its sandwich differently.
The point is that regional foods deserve to keep their regional distinctions.
Everything does not become more understandable by flattening it into one national category.
A Po’boy Is Both a Submarine-Type Sandwich and Something More Specific
This is the apparent contradiction at the heart of the article.
Is a po’boy a kind of submarine sandwich?
Broadly, yes.
Merriam-Webster groups the terms together, and 64 Parishes explicitly describes the po’boy as the Gulf Coast counterpart of the submarine sandwich.
Is po’boy merely Louisiana dialect for any submarine sandwich?
No.
The traditional po’boy carries specific expectations involving New Orleans French bread, a documented local history, familiar fillings, and ordering customs such as having the sandwich dressed.
Both statements can be true.
Category and identity are not the same thing.
Po’boy vs. Submarine Sandwich: The Simple Comparison
Bread:
A submarine uses a long split roll whose style varies by region and restaurant. A traditional po’boy uses light New Orleans-style French bread with a thin crisp crust and airy interior.
Classic fillings:
Subs commonly include deli meats, cheese, meatballs, vegetables, and many other fillings. Po’boys are especially associated with roast beef and gravy, fried shrimp, oysters, catfish, soft-shell crab, hot sausage, ham and cheese, and other Louisiana foods.
Toppings:
Sub toppings vary widely by regional style. A po’boy ordered dressed usually means lettuce, tomato, pickles, and mayonnaise.
History:
The submarine is a broad American long-sandwich category. The modern po’boy is specifically linked to New Orleans, the Martin Brothers, John Gendusa, and the 1929 streetcar strike.
Regional identity:
Submarine sandwiches appear nationally under many names. The po’boy remains strongly tied to New Orleans and Louisiana even though it has spread throughout the Gulf Coast.
The Best Test Is Not Shape
Two sandwiches can both be twelve inches long.
That tells us very little.
Look at the bread.
Look at the filling.
Listen to the language being used at the counter.
Ask how the sandwich fits into the local food tradition.
A long sandwich containing salami, provolone, onions, lettuce, tomato, and oil on a chewy roll may be a classic sub or hoagie.
A light crackly New Orleans loaf packed with fried shrimp and ordered dressed speaks another language.
The silhouette is similar.
The biography is different.
So What Is the Difference Between a Po’boy and a Submarine Sandwich?
At the broadest level, a po’boy belongs to the same American family of long-roll sandwiches that includes submarines, heroes, hoagies, grinders, and torpedoes. Dictionaries reasonably group them together because they share the same basic architecture.
But the traditional New Orleans po’boy developed a much more specific identity.
Its light French bread is thinner-crusted and less dense than a traditional baguette.
Its modern name grew from the 1929 New Orleans streetcar strike and the Martin Brothers’ effort to feed striking workers, while baker John Gendusa helped develop the uniform sandwich loaf associated with the new poor boy.
Its fillings became unmistakably Louisiana:
Roast beef and debris.
Fried shrimp.
Oysters.
Catfish.
Soft-shell crab.
Hot sausage.
French fries.
And whatever else New Orleans decides belongs between the bread.
Its ordering language became local too.
Dressed means lettuce, tomato, pickles, and mayonnaise.
So calling a po’boy a type of submarine sandwich is not exactly wrong.
It is simply incomplete.
A submarine tells you the general shape of the sandwich.
Po’boy tells you where that sandwich learned how to eat.
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