The Thinker is the name of five supervillains appearing in American comic books published by DC Comics.
The first incarnation, Clifford DeVoe, is an enemy of Jay Garrick. The second, Clifford Carmichael, is an enemy of Firestorm. The third, Desmond Carter, is an enemy of Batman. The fourth, an A.I. version of the Thinker, is an enemy of the Justice Society of America. An unidentified incarnation of Thinker, introduced in the New 52, is an enemy of the Suicide Squad.
The character has been adapted from the comics into various forms of media, including television series and feature films. The Clifford DeVoe incarnation of the Thinker made his live-action debut in the television series The Flash, portrayed primarily by Neil Sandilands. In the DC Extended Universe, a variation of the unidentified Thinker called Gaius Grieves appears in The Suicide Squad (2021), portrayed by Peter Capaldi.