A lagoon is a shallow body of water separated from a larger body of water by reefs, barrier islands, or a barrier peninsula.

Lagoon may also refer to:

• "Lagoon", a song by Nightwish from the 2007 reissue of the album Century Child
• Lagoon (novel), by Nnedi Okorafor, 2014
• Lagoon (video game), 1990
• "The Lagoon", an 1897 short story by Joseph Conrad

• Lagoon (amusement park), in Farmington, Utah, U.S.
• Lagoon catamaran, a brand of twin-hulled boat
• Lagoon Nebula, an interstellar cloud
• Lagoon River, in Dominica
• Lagoon, maker of the Choo Choo Bar confectionery
• Waste stabilization lagoon, a waste stabilization pond

• All pages with titles beginning with Lagoon
• All pages with titles containing Lagoon
• Estuary