WrestleMania (sequentially known as WrestleMania I) was the inaugural WrestleMania and inaugural professional wrestling pay-per-view (PPV) event (only in selected areas), produced by the World Wrestling Federation (WWF, now WWE). It took place on March 31, 1985, at Madison Square Garden in New York City. The attendance for the event was 19,121. The event was seen by over one million viewers through closed-circuit television, making it the largest pay-per-view showing of a wrestling event on closed-circuit television in the United States at the time.

The event consisted of nine professional wrestling matches. In the main event, Hulk Hogan and Mr. T defeated Paul Orndorff and Roddy Piper. Also, Wendi Richter (accompanied by manager Cyndi Lauper) defeated Leilani Kai to win the WWF Women's Championship, and Nikolai Volkoff and The Iron Sheik defeated The U.S. Express (Mike Rotundo and Barry Windham) to win the WWF Tag Team Championship. Celebrity guests included former heavyweight boxing champion Muhammad Ali as referee, baseball player/manager Billy Martin as ring announcer, and musician-actor Liberace as timekeeper.