UFC 259: Błachowicz vs. Adesanya was a mixed martial arts event produced by the Ultimate Fighting Championship that took place on March 6, 2021 at the UFC Apex facility in Enterprise, Nevada, part of the Las Vegas Metropolitan Area, United States.

Jan Maciej Błachowicz is a Polish professional mixed martial artist. He currently competes in the Light Heavyweight division for the Ultimate Fighting Championship (UFC), where he is a former UFC Light Heavyweight Champion. A professional since 2007, he also competed for KSW and is the former KSW Light Heavyweight Champion. He is the second Polish champion in UFC history, after Joanna Jędrzejczyk, and the first male Polish champion. As of August 1, 2023, he is #4 in the UFC light heavyweight rankings.