The 1991 Royal Rumble was the fourth annual Royal Rumble professional wrestling pay-per-view (PPV) event produced by the World Wrestling Federation (WWF, now WWE). It took place on January 19, 1991, at the Miami Arena in Miami, Florida. It centered on the Royal Rumble match, a modified battle royal in which participants enter at timed intervals instead of all beginning in the ring at the same time.

Seven matches were contested at the event, including one dark match. The main event was the 1991 Royal Rumble match, which was won by Hulk Hogan, who last eliminated Earthquake, making Hogan the first multi-time Royal Rumble winner. In other featured matches on the undercard, Sgt. Slaughter defeated The Ultimate Warrior to win the WWF World Heavyweight Championship, Ted DiBiase and Virgil defeated Dusty Rhodes and Dustin Rhodes, The Mountie defeated Koko B. Ware, and The Rockers (Marty Jannetty and Shawn Michaels) defeated The Orient Express (Kato and Tanaka).