A seahorse is a marine fish belonging to the genus Hippocampus.

Seahorse or seahorses may also refer to:

Science and technology

  • Hippopotamus, which was often called a seahorse in the mid-nineteenth century
  • Seahorse (software), a GPG front-end application for GNOME

Arts and entertainment

  • Seahorse (2019 film), a British documentary film directed by Jeanie Finlay
  • Seahorse (2026 film), a Canadian drama film directed by Aisha Evelyna
  • The Seahorses, a British rock band
  • Sea Horses (novel), a 1925 novel by Francis Brett Young
  • Sea Horses (film), a 1926 American silent drama film, based on the novel
  • The Sea Horse, a 1974 off-Broadway play by Edward J. Moore; see Royal Manitoba Theatre Centre production history
  • "Seahorses", an episode of the television series Teletubbies
  • Sea Horse Baian, a fictional character in the manga Saint Seiya (aka Knights of the Zodiac)
  • Sea-Horse (folktale), a folktale from Syria

Military

  • USS Seahorse, several United States Navy ships
  • HMS Seahorse, several Royal Navy ships
  • F. F. E. Yeo-Thomas (1902–1964), S.O.E. operative had "SEAHORSE" as a code name during World War II
  • Seahorse, various versions of the Sikorsky H-34 military helicopter
  • Sea Horse, a merchant ship in the wrecking of the Sea Horse, Boadicea and Lord Melville in 1816

Transport

  • Seahorse (HBC vessel, 1734), operated by the HBC from 1734-1764, see Hudson's Bay Company vessels
  • Seahorse (HBC vessel, 1765), operated by the HBC from 1765-1781, see Hudson's Bay Company vessels
  • Seahorse (HBC vessel, 1782), operated by the HBC from 1782-1792, see Hudson's Bay Company vessels

Other uses

  • Hippocampus (mythology) or sea-horse, a mythological creature depicted as a horse in its forepart with a fish-like hindquarter
  • Sea Horse (restaurant), a restaurant in Helsinki, Finland
  • King George V Seahorses, a set of British postage stamps

See also

  • Walrus
  • Battle of Mount Austen, the Galloping Horse, and the Sea Horse, an engagement between United States and Imperial Japanese forces
  • Water horse, any of several mythical creatures