Bellator 263: Pitbull vs. McKee was a mixed martial arts event produced by Bellator MMA that took place on July 31, 2021, at The Forum in Inglewood, California. The event marked Bellator's first outside of the Mohegan Sun bubble and the first Bellator show on the road.

The event was headlined by the final of the Bellator Featherweight World Grand Prix between the current champion Patrício Pitbull and undefeated A. J. McKee, where winner will also win $1 million prize. Pitbull is the current Bellator Lightweight and Featherweight Champion, who is currently on a seven-fight winning streak and hasn't lost since August 2016. He defeated Emmanuel Sanchez via a first-round guillotine choke in their rematch at Bellator 255. McKee is undefeated as a pro at 17-0 and is also coming off of first-round submission of his own in his last fight, defeating Darrion Caldwell with a neck crank at Bellator 253.

A featherweight bout between Mads Burnell and Emmanuel Sanchez was scheduled as the co-main event.

A lightweight bout between Manny Muro and the undefeated Usman Nurmagomedov was scheduled for the event main card.

A lightweight bout between Islam Mamedov and former Bellator lightweight champion Brent Primus was scheduled as the main card opener.

Two ranked bantamweights, the #3 ranked Magomed Magomedov and #4 ranked Raufeon Stots, were scheduled to compete at the event. On July 19, it was announced that the bout was scratched from the event and was rescheduled for Bellator 264.

A women's flyweight bout between Alejandra Lara and DeAnna Bennett was scheduled to take place at this event. The bout was rescheduled for unknown reasons to take place on August 20, 2021, at Bellator 265.

A lightweight bout between Georgi Karakhanyan and Kiefer Crosbie was scheduled for the event prelims.