UFC Fight Night 276: Allen vs. Costa was a mixed martial arts event produced by the Ultimate Fighting Championship that took place on May 16, 2026, at the Meta Apex in Enterprise, Nevada, part of the Las Vegas Valley, United States. A featherweight bout between Arnold Allen and Melquizael Costa served as the event's headliner.

Cast: Arnold Allen, Melquizael Costa, Choi Doo-ho, Daniel Santos, Juan Diaz, Malcolm Wellmaker