UFC 305: du Plessis vs. Adesanya was a mixed martial arts event produced by the Ultimate Fighting Championship that took place on August 18, 2024, at the RAC Arena in Perth, Australia.

The event marked the promotion's third visit to Perth and first since UFC 284 in February 2023, as well as the beginning of a multiyear deal for twice-annual events in the city.

A UFC Middleweight Championship bout between current champion (also former KSW Welterweight Champion) Dricus du Plessis and former two-time champion Israel Adesanya headlined the event. It marked the first time two African-born athletes met for a title in the organization.

A featherweight bout between Gavin Tucker and Jack Jenkins was scheduled for this event. However, Tucker withdrew from the fight due to injury and was replaced by Herbert Burns.

A women's flyweight bout between Casey O'Neill and Tereza Bledá was scheduled for this event. However, Bledá withdrew from the fight for unknown reasons and was replaced by Luana Santos.

At the weigh-ins, Jesús Santos Aguilar weighed in at 127.5 pounds, one and a half pounds over the flyweight non-title fight limit. The bout proceeded at catchweight and Aguilar was fined 20 percent of his purse, which went to his opponent Stewart Nicoll.

The following fighters received $50,000 bonuses.