A Philadelphia Cheese Steak is a sandwich meeting the following criteria: It is made with a submarine or Hoagie roll (an oblong, typically 6" or 12" piece of latitudinally-sliced French or Italian bread); and contains a thinly-sliced, grilled piece of steak; Swiss or Mozzarella cheese; and possibly other ingredients including grilled onions, mushrooms, and/or pizza sauce (a Pizza Steak).

"Philly Cheese Steaks" can be found throughout the U.S. at various sandwich restaurants, some of which specialize in or serve only Cheese Steaks. See also French Dip Sandwiches.