Xbox Game Studios (previously known as Microsoft Studios, Microsoft Game Studios, and Microsoft Games) is an American video game publisher based in Redmond, Washington. It was established in March 2000, spun out from an internal Games Group, for the development and publishing of video games for Microsoft Windows. It has since expanded to include games and other interactive entertainment for the namesake Xbox platforms, other desktop operating systems, Windows Mobile and other mobile platforms, and web-based portals. Xbox Game Studios, alongside ZeniMax Media and Activision Blizzard, are part of the Microsoft Gaming division led by Phil Spencer, who is chief executive officer of the division.

The studio rebranded itself on February 5, 2019, as Xbox Game Studios, as to reflect Microsoft's intent to use the Xbox brand to support gaming across all the devices it supports. At E3 2019, Xbox Game Studios announced it had acquired Double Fine, and established a new internal studio dedicated to Age of Empires headed by Shannon Loftis, bringing their total studio count to fifteen. This studio, later named World's Edge, does not directly develop any games, but oversees efforts from external studios, such as Relic Entertainment, Forgotten Empires and Tantalus Media, to assure the series is being developed in the right direction, according to creative director Adam Isgreen.

Booty has stated that with studios like Obsidian, Ninja Theory, and Double Fine, which have traditionally supported multiplatform games, they will determine if it makes sense for their future products to be treated as Microsoft-exclusive content for Xbox and Windows computers, or to allow these to be published across multiple platforms. That decision will be based on a "network effect", whether having these games on other platforms will better support the franchise and thus worthwhile for Microsoft to help dedicate resources towards it, such as they had with Minecraft. Xbox Game Studios has allowed some of the content developed by its studios or that was previously published exclusively for the Xbox and Windows systems to be released on Nintendo systems, notably the Nintendo Switch versions of Cuphead from Studio MDHR and Ori and the Blind Forest from Moon Studios, and allowing for the titular characters from Rare's Banjo-Kazooie into Super Smash Bros. Ultimate. However, the division stated that these releases were generally "existing commitments to other platforms" that they allowed studios to honor, but they otherwise have "no plans to further expand our exclusive first party games to other consoles."

Near the end of 2019, with the combined fifteen studios now under Xbox Game Studios, Booty stated that they now had more games than ever to handle, and were likely not going to acquire any additional studios in the near future, stating "we've been shifting our focus inside Xbox Game Studios from acquisition and growth, to a phase of execution and delivery". Additionally, as Microsoft started promotion of its fourth-generation of Xbox, including the Xbox Series X, Booty stated that titles developed by Xbox Game Studios in year or two following its release will not be exclusively for the new generation of consoles, but instead will support both Xbox One and the new console, with some games receiving enhanced performance when played on the new console lineup. Booty said that with the large number of studios they had recently acquired, as well as ongoing external partnerships and their Xbox Game Pass service, the Studios are able to support a "breadth of offerings in the portfolio" designed to attract a large number of players. Further, in an interview in November 2020, Phil Spencer said during an interview regarding the future of the Xbox brand that he intends to put more focus on outputting RPGs, which had to that point been underserved.