A reef is a bar of rock, sand, coral or similar material, lying beneath the surface of water.

Reef may also refer to:

Earth science Coral reef, a type of reef that is formed by coral Gold reef, a synonym for a gold vein

Places (Portuguese for "reef"), capital of the Brazilian state of Pernambuco Reef (Scottish Gaelic: ), a small village in Uig, Lewis, Scotland

People Reef the Lost Cauze, an American rapper

Arts, entertainment, and media Reef (band), a British band Reef (novel), a 1994 novel written by Romesh Gunesekera

Other uses Reef (company), an American apparel and shoe company Reef knot, a kind of knot Reefing, an action performed on sails to reduce the area on which the wind can act

See also The Reef (disambiguation) Wreath