Raiden, sometimes spelt Rayden, is a video game character in the Mortal Kombat fighting game series by Midway Games/NetherRealm Studios. Making his official debut as one of the original seven playable characters in 1992's Mortal Kombat, Raiden is one of the franchise's central characters. Based on the Japanese thunder god, Raijin, and portrayed in the series canon as the thunder god and appointed protector of Earthrealm, Raiden defends the planet from myriad otherworldly threats alongside his handpicked warriors. He commands many supernatural abilities such as teleportation, flight, and control of lightning.

A mainstay of the Mortal Kombat cast, Raiden has appeared as a playable character in every fighting instalment except Mortal Kombat 3 and its upgrade. It was among the eleven characters representing the franchise in the crossover title Mortal Kombat vs DC Universe. Raiden was also featured in Injustice 2 as a DLC character, with a design by comic book artist Jim Lee. He has featured extensively in other Mortal Kombat media such as the two feature films, the animated series Mortal Kombat: Defenders of the Realm, the television series Mortal Kombat: Konquest, and the Mortal Kombat: Legacy web series, in addition to appearing on official series merchandise. General and critical reception of the character about his design and gameplay has been positive but mixed in his alternate-media appearances.