Mortal Kombat is an American media franchise centered on a series of fighting video games originally developed by Midway Games in 1992.

The original Mortal Kombat arcade game spawned a franchise consisting of action-adventure games, a comic book series, a card game, films, an animated TV series, and a live-action tour. Mortal Kombat has become the best-selling fighting game franchise worldwide and one of the highest-grossing media franchises of all time.

The series has a reputation for high levels of graphic violence, including, most notably, its fatalities, which are finishing moves that kill defeated opponents instead of knocking them out. Controversies surrounding Mortal Kombat, in part, led to the creation of the Entertainment Software Rating Board (ESRB) video game rating system. Early games in the series were noted for their realistic digitized sprites and an extensive use of palette swapping to create new characters. Following Midway's bankruptcy, the Mortal Kombat development team was acquired by Warner Bros. Entertainment and re-established as NetherRealm Studios

Through its iterations, the series has featured scores of player characters, some of them becoming mainstays, such as Baraka, Cassie Cage, Cyrax, Ermac, Fujin, Goro, Jade, Jax, Johnny Cage, Kabal, Kano, Kenshi, Kintaro, Kitana, Kung Lao, Li Mei, Liu Kang, Mileena, Motaro, Nightwolf, Noob Saibot, Quan Chi, Raiden, Rain, Reptile, Scorpion, Sektor, Shang Tsung, Shao Kahn, Sheeva, Shinnok, Sindel, Skarlet, Smoke, Sonya Blade, Stryker, Sub-Zero and Tanya. Among them are Earth's humans and cyborgs, good and evil deities, and denizens of Outworld and other realms.

Starting with Mortal Kombat vs. DC Universe, which featured several DC Universe heroes and villains, all subsequent games have included guest characters such as Freddy Krueger from A Nightmare on Elm Street franchise, Kratos from the God of War franchise (exclusively for PlayStation 3), Jason Voorhees from the Friday the 13th franchise, the Xenomorph from Alien, Leatherface from the Texas Chainsaw Massacre franchise, the titular character of Predator, the titular character of the Terminator franchise, the titular character of RoboCop, Spawn of Image Comics, Omni-Man from Image Comics's Invincible, John Rambo, Homelander from The Boys, and the Joker, who was previously in Mortal Kombat vs. DC Universe, and Peacemaker (more specifically: the character from the DC Extended Universe and DC Universe), both from DC Comics.