Yakuza 0 is an action-adventure game developed by Ryu Ga Gotoku Studio and published by Sega. It is the sixth main entry in the Yakuza series and a prequel to the original game. It was released for PlayStation 3 and PlayStation 4 in Japan in March 2015, and in North America and Europe for PlayStation 4 in January 2017. It was released on Windows on 1 August 2018 and on Xbox One on 26 February 2020. A free accompanying game application for PlayStation Vita, titled Yakuza 0: Free to Play Application for PlayStation Vita, was released in Japan in February 2015. Set in late 1988 during Japan's bubble era, and seventeen years before the events of the first game, the story follows Kazuma Kiryu and Goro Majima as they get embroiled in a conflict between various Yakuza factions for control of a patch of land known as the "Empty Lot".

The game received generally favourable reviews from critics, and is largely responsible for the franchise's rise in popularity and sales in the West, the series being deemed obscure beforehand. Yakuza 0 was followed up by a remake of the original game, Yakuza Kiwami, the next chronological installment of the series.

Yakuza 0 is an action-adventure game set in an open world environment and played from a third-person perspective. The game takes place from December 1988 to January 1989, in Kamurochō and Sotenbori, fictionalized recreations of Tokyo's Kabukichō and Osaka's Dōtonbori areas respectively. The player controls series protagonist Kazuma Kiryu and recurring character Goro Majima, alternating between the two at predetermined points during the story.

Players can freely walk around Kamurocho and Sotenbori, interacting with people they meet to trigger side-quests, battling enemies who attack them on the street, or playing several minigames, including fully playable versions of Sega arcade games such as Out Run, Super Hang-On, Space Harrier and Fantasy Zone. Completing certain objectives, such as eating every dish at a restaurant or reaching a target score in a minigame, will also grant the player special Completion Point currency; these Completion Points can be spent at a shrine to receive additional bonuses, such as special items or character upgrades.

Character customization and growth is similar to the system from Ryu ga Gotoku Ishin!, with abilities bought off of a skill tree that is gradually unlocked during the game. Instead of using experience points to buy skills, the player uses money acquired from fights or via Kiryu and Majima's side businesses. Money is more liberally awarded in Yakuza 0 than in previous entries, with every heavy attack causing enemies to drop cash. The player can lose their money if they encounter a special enemy called Mr. Shakedown, huge men who are far stronger than normal. If the player is beaten, they will lose all their cash, but can beat the enemy again to earn back their money and extra.

Kiryu and Majima also have side businesses that they run during the game to earn money: Kiryu invests in real estate in Kamurocho, while Majima runs a cabaret club in Sotenbori. Completing side-quests will often result in characters they meet offering to help with side businesses, allowing players to more easily and quickly progress. Progressing in side business sequences or training with specific masters will unlock additional abilities for purchase on the characters' skill trees.