Thinker

 Thinker  could refer to:


 * Clifford DeVoe, A DC Comics supervillain and foe of the Golden Age Flash.
 * Clifford DeVoe, Version seen in the DC Animated Universe.
 * Clifford DeVoe, Version seen on the Batman: The Brave and the Bold animated series.
 * Cliff Carmichael, A DC Comics supervillain and foe of Firestorm; Member of the Suicide Squad
 * Desmond Connor, A DC Comics supervillain and foe of Batman.
 * Thinker AI, A cybernetic entity featured in DC Comics titles.
 * Mad Thinker, A Marvel Comics supervillain and foe of the Fantastic Four.
 * Sarah II, The Thinker from the Ultimate Marvel Universe.