For the Warhammer 40,000 army, see Space Marines (Warhammer 40,000).

Space marines are fictional soldiers that operate in outer space. Space marines are common in military science fiction-themed action movies and action games. Historical marines fulfill amphibious roles: ship defense, landing parties, and general high-mobility deployments. By extension, space marines defend spaceships, land on planets and satellites, and fulfill rapid deployment throughout space.

The first space marine unit, the Galactic Marines, was used in E. E. Smith's Lensman series, published starting in 1937.Template:Fact

The phrase "space marines" first appears in Robert A. Heinlein's "Misfit"<ref>"The parade ground voice of a First Sergeant of Space Marines cut through the fog and drizzle..."</ref> (1939) and is again used in "The Long Watch"<ref>"Space marines, arms reversed and heads bowed, stood guard around [the coffin]..."</ref> (1941). Heinlein's Starship Troopers (1959) is considered the defining work for the concept; for example, the actors playing the Colonial Marines in Aliens (1986) were required to read Starship Troopers as part of their training prior to filming.<ref>==Further reading==
Community content is available under CC-BY-SA unless otherwise noted.