Gaian may refer to:
Nonfiction An adherent of Gaianism A person who adopts technogaianism, a slant on Gaianism that embraces a symbiosis between the emergence of modern technology and ancient terrestrial evolutionary biology A follower of Gaia philosophy A shortened form of the Roman name Gaianus
Fiction Gaian (demonym), a demonym commonly associated in science fiction with humans A faction the player can choose to control in the computer game Sid Meier's Alpha Centauri A user of the popular forum Gaia Online or the Avatar character used to represent the user The House of Gaian, from the Tir Alainn Trilogy by Anne Bishop
See also Gaia (disambiguation)