Tekken 4 (鉄拳4) is a 2001 fighting game developed and published by Namco for arcades. Initially released for Namco's System 246 hardware, it was then ported to the PlayStation 2 home console in 2002. As the fourth main installment in the Tekken series following Tekken 3 (1997), and the fifth overall following the non-canon title Tekken Tag Tournament (1999), the game harbored many gameplay revisions, such as the series-unique ability for the player to move about before the round begins and the introduction of walled stages.

There are up to twenty-three playable characters, six of which are newcomers. Placing distinction on the plot in the console version, the tone of Tekken 4 was noticeably darker than other installments in the series. The game notably features the canonical return of Kazuya Mishima, whose story reveals that he was revived following his death 20 years prior and has entered the King of Iron Fist Tournament 4 to take back the Mishima Zaibatsu from his father Heihachi Mishima and seek out his son Jin Kazama.

Tekken 4 received generally favorable reviews. The reception from established veteran players in the gaming community was initially mixed, with competitive players pointing out its juggling and traditional gameplay replaced by realism through uneven floors and walls in actual vicinities, as well as more aggression and poking, akin to boxing or fencing. However, in recent years, Tekken 4 has recovered to the point of being widely praised, largely for its innovation in gameplay, atmosphere and sound, and attention to detail,[6] particularly in the story, art, and world-building. Some gamers and reviewers have called it the pound-for-pound best game in the series. Its sequel, Tekken 5, was released in 2004.