Business magnate Elon Musk initiated an acquisition of American social media company Twitter, Inc. on April 14, 2022, and concluded it on October 28, 2022. Musk had begun buying shares of the company in January 2022, becoming its largest shareholder by April with a 9.1 percent ownership stake. Twitter invited Musk to join its board of directors, an offer he initially accepted before declining. On April 14, Musk made an unsolicited offer to purchase the company, to which Twitter's board responded with a "poison pill" strategy to resist a hostile takeover before unanimously accepting Musk's buyout offer of $44 billion on April 25. Musk stated that he planned to introduce new features to the platform, make its algorithms open-source, combat spambot accounts, and promote free speech.

Elon Musk completed his acquisition of Twitter in October 2022; Musk acted as CEO of Twitter until June 2023 when he was succeeded by Linda Yaccarino. Twitter was then rebranded to X in July 2023. Initially during Musk's tenure, Twitter introduced a series of reforms and management changes; the company reinstated a number of previously banned accounts, reduced the workforce by approximately 80%, closed one of Twitter's three data centers, and largely eliminated the content moderation team, replacing it with the crowd-sourced fact-checking system Community Notes.