The year 2020 was the 28th year in the history of the Ultimate Fighting Championship (UFC), a mixed martial arts promotion based in the United States.

Starting in 2021, a partnership between the UFC and Dapper Labs's Flow platform for MMA fans to own, maintain and trade UFC-branded collectibles was announced on February 26, 2020.

Onwards from April 2021, the UFC announced Venum as their exclusive outfitting partner on July 11, 2020.

Starting in 2019, the UFC created year-end awards with "UFC Honors President's Choice Awards" for categories "Performance of the Year" and "Fight of the Year" being chosen by UFC CEO Dana White. The other "UFC Honors Fan Choice Awards" are for categories "Knockout of the Year", "Submission of the Year", "Event of the Year", "Comeback of the Year" and, from 2020, "Debut of the Year" in which fans are able to vote for the winner on social media.

Winners receive a trophy commemorating their achievement along with a set of tires from sponsor Toyo Tires.

The numbers below records the events, fights, techniques, champions and fighters held or performed for the year of 2020 in UFC.

These fighters have either been released from their UFC contracts, announced their retirement or joined other promotions:

The following fighters fought their first UFC fight in 2020: