UFC 184: Rousey vs. Zingano was a mixed martial arts event held on February 28, 2015, at Staples Center in Los Angeles, California.

[3] A UFC Middleweight Championship bout between Chris Weidman and Vitor Belfort was expected to serve as the event headliner.

However, on January 30, the UFC announced that Weidman had pulled out of the bout, citing an injury he sustained in training.

[4] Subsequently, a UFC Women's Bantamweight Championship bout between current champion Ronda Rousey and top contender Cat Zingano was promoted to the main event.

[17][18] Yancy Medeiros was slated to face Tony Ferguson at this event, but an injured foot forced him out of the bout.