Fin may refer to:

• Fin, a surface used to produce lift and thrust or to steer while traveling in water, air, or other fluid media
• Swimfin, finlike shoes to help movement through the water
• Tailfin, a styling feature of automobiles
• An external rib on a radiator which increases its surface area and cooling effect
• Fin (the band), a brit-pop band on GoDigital Records
• Fin (band), a band on Journey's End Studios
• Fin (troll), a troll in a Danish legend
• Fin Garden, an historical garden in Kashan, Iran
• Fin, a town in the Hormozgan province of Iran
• Fin, the orca that is the official mascot of the NHL's Vancouver Canucks
• Fin Tutuola, a fictional character on the TV drama Law & Order: Special Victims Unit
• United States five-dollar bill
• Fin (extended surface), a surface used to increase the rate of heat transfer of an object
• A FIN packet in the Transmission Control Protocol (TCP).
• Fin, the French word for "end", often appearing at the end of films.

• Finn