A fin is an appendage used to produce lift and thrust or to steer while traveling in water, air, or other fluid media.
Fin, FIN, or Fins may also refer to:
- Fín (died 604), Gaelic princess, wife of Oswiu of Northumbria
- Finns, people from Finland
- Fin Bartels (born 1987), German football midfielder
- Fin Donnelly (born 1966), Canadian politician
- Fin Dow-Smith, (born 1988), British songwriter
- Fin Leavell, American musician
- Fin Taylor, (born 1990), English stand-up comedian
- Fin Wilson (1888–1959), American professional baseball pitcher
- Henri Fin (born 1950), French cyclist
Legendary and fictional characters
- Fin, Iran, a city
- Fins, Somme, a commune in France
- Fin District, Iran
- Fin Garden, in Kashan, Iran
- Fin Island, in British Columbia, Canada
- Fin Rural District, Iran
- Finland
- Fin (band), an English indie rock band
- Fin (John Talabot album), 2012
- Fin (Syd album), 2017
- "Fin", a 2006 song by Supergrass from the album Road to Rouen
- "Fin" (song), a 1986 song by Akina Nakamori
- "Fin", a song by Christie Front Drive from Christie Front Drive, 1997
- "Fin", a song by Nebula from the 2003 album Atomic Ritual
- "Fins" (song), a 1979 song by American singer Jimmy Buffett
- "(*Fin)", a song by Anberlin from their 2007 album Cities