Alien 3 (stylized as ALIEN³) is a 1992 run and gun video game based on the film of the same name. It was released for the Sega Genesis and Amiga in 1992, then for the Commodore 64, Game Boy, Game Gear, Nintendo Entertainment System, Super Nintendo Entertainment System, and Master System.

Each version was developed by Probe Software, except for the Game Boy version, which was developed by Bits Studios.

Alien 3 is a side-scrolling run and gun game in which the player controls Ellen Ripley, the film's main character, who progresses through the Fiorina 161 prison colony that was featured in the film. The player can jump, shoot, climb ladders, crawl through tunnels, open doors and use elevators. Unlike the film, Ripley has a large arsenal of weapons that can be used against the game's enemies, consisting of Aliens and Facehuggers. Weapons include pulse rifles, flamethrowers and grenades. A motion tracker warns the player of nearby enemies.

Level objectives are chosen from computer terminals, which are located throughout the game and also offer blueprints of the prison layout. Objectives include sealing off doors to prevent Aliens from entering, and rescuing prisoners. A time limit is present on each level, and the player loses a life if the level is not completed before the time expires. The game concludes with a battle between Ripley and the Alien Queen.

The SNES version includes six stages, and a password feature, which is absent from the Game Boy version. The Sega Genesis version includes 15 stages. The Genesis and SNES versions differ in design and graphics, and the Genesis version includes larger Alien character models. The Amiga version, which has 14 levels, features gameplay that moves slightly slower than the Genesis version, but is otherwise nearly identical. The Commodore 64 version has 15 levels, and is a nearly identical port of the Amiga version, but with slightly different level layouts. The Game Gear version is identical to the other versions of the game. The Master System version uses the same level layouts as the Genesis version, but includes a two-player option. The Game Boy version, unlike other versions of the game, is played from an overhead perspective.

The Genesis version was originally scheduled for a U.S. release in summer 1992, but was ultimately released in October 1992 for both North America and Europe. Also in Europe, the Amiga version was released in November 1992. In the United States, the Game Boy version was released in January 1993, while the NES version was released in March 1993, and the SNES version was released in June 1993. The SNES version was subsequently released in the United Kingdom in July 1993. The Commodore 64 version was released in Europe in November 1993.

GamePro praised the SNES version for its music, sound effects and graphics, and concluded that the game was "highly original–enough to please even jaded veterans of the Alien 3 wars on other systems." Jonathan Davies of Super Play praised the graphics of the SNES version and called it "damn good fun", while noting that it "makes effective use of the license without trying to be too true to it". Scott Alan Marriott of AllGame praised the sound and smooth animation of the SNES version and wrote, "Despite everything being gray and metallic-looking, the graphics are extremely impressive."

Nintendo Power praised the SNES version's action, sound, graphics and its diverse variety of missions, but criticized blueprints for only being accessible from computer terminals. Nintendo Magazine System praised the large number of levels in the SNES version, as well as the music and sound effects, but noted that the control system "takes a bit of getting used to". Nintendo Magazine System praised the music of the Game Boy version, but criticized the lack of abundant sound effects, as well as the absence of a password system. The magazine concluded that it was a "spiffing game, imaginatively designed and well-programmed". Nintendo Power praised the "very effective" cinema scenes in the Game Boy version, but criticized the controls for being slow to respond. Skyler Miller of AllGame noted that the NES version "isn't a mindless shooting fest," and wrote that the "atmosphere is appropriately creepy, with a gloomy color palette, foreboding soundtrack, and some semi-gory scenes".