Decima

Decima can refer to:


 * Decima gallery, a London-based arts organisation
 * Decima (game engine), a proprietary game engine by Guerrilla Games
 * Decima (mythology), a goddess in Roman mythology and one of the Parcae (Fates)
 * Decima Research, a Canadian polling company
 * Décima, a type of poetry with ten stanzas, rooted in Spanish literature
 * Décima, the one-tenth tithe in Spain that is traditionally donated to a religious institution, the tithe itself called diezmo in Spanish
 * Dejima, a foreign trading post off the coast of Nagasaki, Japan, during the 16th to 19th century
 * SB Decima, a Thames barge built in 1899
 * The Decimas, a race of fictional creatures in the British science-fiction television series Blake's 7
 * Decima Flottiglia MAS, an Italian flotilla, with commando frogman unit, of the Regia Marina (Italian Royal Navy) created during the Fascist regime