Lucid is a dataflow computer language designed to experiment with non-VonNeumann programming models. It was designed by Bill Wadge and Ed Ashcroft and described in the book Lucid, the Dataflow Programming Language.

It employed several techniques from functional programming. Several languages evolved from Lucid. Original Lucid is no longer maintained or used.

Lucid is also the surname of astronaut Shannon Lucid.

Lucid is also the name of a motion picture by the Birmingham Alabama based cooperative, Amen-Ta.