UFC 243: Whittaker vs. Adesanya was a mixed martial arts pay-per-view event produced by the Ultimate Fighting Championship that took place on October 6, 2019, at Marvel Stadium in Melbourne, Australia.

[2][3] The event was the fourth that the promotion had contested in Melbourne and second at the venue, following UFC 193 in November 2015.

[3] A UFC Middleweight Championship unification bout between the champion Robert Whittaker (also The Ultimate Fighter: The Smashes welterweight winner) and undefeated interim champion Israel Adesanya served as the event's headliner.

[7] At the weigh-ins, Khalid Taha and Ji Yeon Kim missed the required weight for their respective fights.

Taha and Kim were fined 20% and 30% of their purse respectively, which went to their opponents Bruno Gustavo da Silva and Nadia Kassem.