A porpoise is a marine mammal of the family Phocoenidae.
Porpoise may also refer to:
Dolphin or dolphin-like marine mammal, previously used in American English Porpoise (scuba gear), a trade name for scuba gear developed by Ted Eldred in Australia Porpoise class submarine (disambiguation), various classes of British or United States submarines HMS Porpoise, several British Royal Navy ships USS Porpoise, several United States Navy ships Karry Porpoise, a Chinese electric commercial van President Porpoise, a character in the animated series Adventure Time episode "President Porpoise Is Missing!"
See also Porpoising, a fault encountered in ground effect racing cars