A submarine is a specialized watercraft that can operate underwater. Submarine may refer to:

Submarine sandwich, on a long roll split lengthwise

The Submarine (shark), large and aggressive Great White dwelling in False Bay, near Cape Town, South Africa

Submarine (band), the UK band.

Submarine (baseball), a way of pitching the ball.

The Submarines, an American indie rock band on Nettwerk.

Submarine (song) is a song of Björk on her album Medulla.