The Living Tribunal is a fictional cosmic entity appearing in American comic books published by Marvel Comics. The character first appeared in Strange Tales #157 (June 1967) and was created by Stan Lee, Marie Severin, and Herb Trimpe. Please use this tag with the [marvel] tag, and only for questions about the character, not those that merely mention them.

The Living Tribunal is an entity that oversees and maintains balance in the realities that constitute the Marvel Comics Multiverse, including the mainstream universe and all alternate universes. He serves as a judge of these realities.

The character is first encountered by Doctor Strange, announcing its intent to destroy Earth due to its potential for evil. After a series of trials Dr. Strange is able to convince the Living Tribunal that good also exists, and Earth is spared. The Tribunal reappears to the Galadorian spaceknight Rom; appears briefly with the rest of the cosmic hierarchy when in discussion with the entity the Beyonder; and reveals to the former Herald of Galactus (the Silver Surfer) that its three faces represent "Equity" (hooded face), "Vengeance" (partially shrouded face), and "Necessity" (fully shrouded face). The fourth side of the Living Tribunal's head is a void, with the entity claiming that the cosmic entity the Stranger once existed as this part of its being. The character also witnesses the triumph of the hero Quasar—acting as the avatar of cosmic entity Infinity—over the villain Maelstrom, who acts for the entity Oblivion.

The Living Tribunal's power is virtually limitless, as the entity prevents the Infinity Gems from being used in unison, although it remains subservient to a single, even higher entity referred to as "The One Above All". The entity has representatives called The Magistrati who dispense judgments by request on alien worlds, and chose to reveal the previously unseen face of "Necessity" to She-Hulk as a reflection of her own face, stating that the face is a "Cosmic Mirror which reminds us to always judge others as we would have ourselves judged".