Umpire abuse refers to the act of abuse towards an umpire, referee, or other official in sport. The abuse can be verbal abuse (such as namecalling), or physical abuse (such as punching). For example, Australian Football League spectators use the term "white maggot" (derived from their formerly white uniforms) towards umpires at games, when they do not agree with an umpire's decision.

Umpire abuse has become quite common in sport, practiced by players, coaches and spectators, with one Australian Football league having half the tribunal cases heard about umpire abuse. There have also been some high-profile cases of abuse towards the umpires in sport, with one Australian football player suspended for life after striking an umpire.

At the end of the 1996 Major League Baseball season, Baltimore Orioles player Roberto Alomar spat in MLB umpire John Hirschbeck's face during a dispute. Alomar received a five-game suspension for the incident, but the punishment would be served at the start of the 1997 season, not during the upcoming postseason, which allowed Alomar to participate in the Orioles' playoff games. MLB umpires, upset over the lack of an immediate suspension, threatened to go on strike before a federal judge prevented them from doing so. Ultimately, Alomar served the suspension at the start of the season as intended, and both him and Hirschbeck publicly apologized to each other the first game the two played and umpired in, with Alomar also donating to a ALD charity in Hirschbeck's honor.

During the 2008 Beijing Olympics, Angel Valodia Matos from Cuba pushed and then kicked a referee in the face during a Taekwondo match. He was disqualified for taking too much injury time in the bronze medal match by referee Chakir Chelbat, before kicking Chelbat in the face. The referee required stitches in his lip after the attack. The World Taekwondo Federation has banned Matos and his coach from taekwondo competitions for life.

In 2016, Mark Jamar, an Essendon AFL player has been fined $1500 for umpire abuse. The umpire, Mathew Nicholls, reported Jamar after he expressed his annoyance that he wasn't awarded a free kick in a marking contest.

Leagues and the like are trying to stop abuse towards umpires.

In Australian rules football, attempting to strike or striking an umpire, abusing or threatening an umpire, or disputing an umpires decision is a reportable offense, per the Laws of Australian Football. It is also possible to send a player off for up to the remainder of the game for abusing an umpire, however this is only usually practiced at amateur and junior level. There have also been other programs trailed, such as making players suspended for umpire abuse attend umpire training sessions.

In cricket, the preamble to the Laws of Cricket state that it is not within the spirit of cricket to abuse an umpire, and to dispute their decisions.