潜艇三明治（英语：Submarine sandwich，简称sub），亦暱称为「鱼雷堡」（torpedo）等，是一种意-美式的三明治。以矩形面包条（通常为意大利或法国面包）为基底，纵切为二，中间夹上各式肉类、芝士、蔬菜、香料与酱汁。在美国，潜艇三明治并没有统一通用的名称，各主要城市都有不同的称呼，而「潜艇三明治」一词较普遍为众人所知。一般认为「潜艇」一词源自二战时，美国麻萨诸塞州波士顿斯科雷广场（Scollay Square）的一家餐馆。

A submarine sandwich, also known as a sub, wedge, hoagie, hero, grinder, or one of the many regional naming variations, is a type of sandwich that consists of a long roll of bread split widthwise into two pieces, and filled with a variety of meats, cheeses, vegetables, seasonings, and sauces. The sandwich has no standardized name, and many U.S. regions have their own names for it; one study found 13 different names for the sandwich in the United States. The usage of the several terms varies regionally, but not in any pattern, as they have been used variously by the people and enterprises who make and sell them. The terms submarine and sub are widespread and not assignable to any certain region, though many of the localized terms are clustered in the northeastern United States.