Deluge, in the Bible, the overwhelming flood that covered the earth and destroyed every living thing except the family of Noah and the creatures in his ark. Archaeology has yielded little trace of the biblical flood, but some oceanographers and geophysicists have speculated that the actual deluge occurred in the Black Sea region some 7,600 years ago, when rising sea levels in the Mediterranean (due to melting glaciers) flooded into the Black Sea and inundated the surrounding coast.

Many archaeologists and historians, however, do not believe that the inundation of the ancient Black Sea coast is the origin of the flood story, regarding the periodic flooding of the Tigris and Euphrates as a more likely model for the tale. Flood stories resembling the biblical story are found in the folklore of many races—Native Americans, Fiji Islanders, and Australian aborigines. The earliest known of these stories is Sumerian, one form being found in the record of Berossus (3d cent. B.C.), another on a tablet of the Gilgamesh epic of at least 2000 B.C. See Deucalion and Ur.

A deluge is a large downpour of rain, or a flood. Prehistoric and mythical floods

• Deluge (mythology), mythic floods in general, involving Gilgamesh, and others
• Deluge (prehistoric), prehistoric great floods, some of which may have inspired the mythic floods
• Noah's Flood, a narrative described in the Book of Genesis Polish and Lithuanian history and culture
• Deluge (history), the Swedish invasion of Polish-Lithuanian Commonwealth (1655-1660)
• The Deluge (novel), Potop, a novel by Nobel Prize winner Henryk Sienkiewicz about it
• The Deluge (film), based on the novel Other
• Deluge (fine art photography), a museum exhibit by David LaChapelle
• Deluge (novel), a 1928 novel by S. Fowler Wright
• Deluge (film), a 1933 apocalyptic science fiction film loosely based on the novel
• Deluge, a 2008 novel by Anne McCaffrey and Elizabeth Anne Sarborough
• "Deluge" (M*A*S*H), an episode of M*A*S*H from season 4
• Before The Deluge (Jackson Browne song), a Jackson Browne song from Late for the Sky
• Deluge (software), a BitTorrent client created using Python and GTK+
• Deluge fire suppression systems, systems that have all sprinklers connected to the water piping system open
• Flame Deluge, a devastating nuclear war from Walter M. Miller, Jr.'s novel A Canticle for Leibowitz
• The Deluge (album), a 1986 album by Manilla Road
• Deluge (fireboat), a boat used in firefighting