Mojang AB, trading as Mojang Studios, is a Swedish video game developer based in Stockholm. A first-party developer for Xbox Game Studios, the studio is best known for developing the sandbox and survival game Minecraft, the best-selling video game of all time.

Mojang Studios was founded by the independent video game designer Markus Persson in 2009 as Mojang Specifications for Minecraft's development. The studio inherited its name from another video game venture Persson had left two years prior. Following the game's initial release, Persson, in conjunction with Jakob Porsér, incorporated the business in late 2010, and they hired Carl Manneh as the company's chief executive officer. Other early hires included Daniel Kaplan and Jens Bergensten. Minecraft became highly successful, giving Mojang sustained growth. With a desire to move on from the game, Persson offered to sell his share in Mojang, and the company was acquired by Microsoft in November 2014. Persson, Porsér, and Manneh subsequently left Mojang. In May 2020, Mojang was rebranded as Mojang Studios.

As of 2021, the company employs approximately 600 people and has additional locations in London, Shanghai, Tokyo, and Redmond, Washington, where Microsoft is headquartered. Kayleen Walters is the studio head. Apart from Minecraft, Mojang Studios has developed Caller's Bane, Crown and Council, and further games in the Minecraft franchise: Minecraft Dungeons, Minecraft Legends, and the cancelled Minecraft Earth. It also released smaller games as part of game jams organised by Humble Bundle and published the externally developed Cobalt and Cobalt WASD.

Mojang Studios was founded by Markus Persson, a Swedish independent video game designer and programmer, in 2009. He had gained interest in video games at an early age, playing The Bard's Tale and several pirated games on his father's Commodore 128 home computer, and learned to programme at age eight with help from his sister. Because he was a "loner" in school, he spent most of his spare time with games and programming at home. Following his graduation and a few years of working as a web developer, Persson created Wurm Online, a massively multiplayer online role-playing game, with his colleague Rolf Jansson in 2003. They used the name "Mojang Specifications" during the development and, as the game started turning a profit, incorporated the company Mojang Specifications AB (an aktiebolag) in 2007. The name is derived from the Swedish word mojäng (Swedish pronunciation: [mʊˈjɛŋː]; lit. 'gadget'). Persson left the project in the same year and wished to reuse the name, so Jansson renamed the company Onetoofree AB and later Code Club AB. Meanwhile, Persson had joined Midas, later known as King.com, where he developed 25–30 games. He departed the company when he was barred from creating games in his free time.

In May 2009, Persson began working on a clone of Infiniminer, a game developed by Zachtronics and released earlier that year. Persson reused assets and parts of the engine code from an earlier personal project and released the first alpha version of the game, now titled Minecraft, on 17 May 2009, followed by the first commercial version on 13 June. He reused the name "Mojang Specifications" for this release, registering a sole proprietorship with this name on 18 June. In less than a month, Minecraft had generated enough revenue for Persson to take time off his day job, which he was able to quit entirely by May 2010. As all sales were processed through the game's website, he did not have to split income with third parties. The payment services provider PayPal temporarily disabled his account when it suspected fraud.

In September 2010, Persson travelled to Bellevue, Washington, to the offices of video game company Valve, where he took part in a programming exercise and met with Gabe Newell, before being offered a job at the company. He turned down the offer and instead contacted Jakob Porsér, a former colleague from King.com, to ask for aid in establishing a business out of Mojang Specifications. Porsér quickly quit his job, and the pair incorporated Mojang AB on 17 September. While Persson continued working on Minecraft, Porsér would develop Scrolls, a digital collectable card game. Wishing to focus on game development, they hired Carl Manneh, a manager at jAlbum, Persson's former employer, as chief executive officer. Other significant early hires included Daniel Kaplan as business developer, Markus Toivonen as art director, and Jens Bergensten as lead programmer.

In January 2011, Minecraft reached one million registered accounts and ten million six months thereafter. The continued success led Mojang to start the development of a new version for mobile devices. Due to the incompatibility of the game's Java-based framework with mobile devices, this version was programmed in C++ instead. Another version, initially developed for Xbox 360, was outsourced to Scotland-based developer 4J Studios, which also used C++. Scrolls was announced by Mojang in March 2011. The studio's attempt to trademark the game's name resulted in a dispute with ZeniMax Media, which cited similarities between the game's name and that of the ZeniMax-owned The Elder Scrolls series. Kaplan stated in May 2011 that, due to many such requests in the past, Mojang was planning to publish or co-publish games from other indie game studios. Its first, Cobalt from Oxeye Game Studio, was announced in August. An early version of the game was made available in December 2011, with the full game released in February 2016 for Xbox 360, Xbox One, and Windows. A multiplayer-focused spin-off, Cobalt WASD, was also developed by Oxeye Game Studio and released by Mojang for Windows in November 2017 after some time in early access.

For the full release of Minecraft, Mojang held Minecon, a dedicated convention, in Las Vegas on 18–19 November 2011, with Minecraft formally being released during a presentation on the first day. Thereafter, Minecon was turned into an annual event. Following Minecraft's full release, Persson transferred his role as lead designer for the game to Bergensten in December 2011.