Referees and umpires

thumb|Cristiano Ronaldo being booked by a referee for foul or misconduct during a game of football thumb|Dean Morton, a referee in the [[American Hockey League]] A referee is an official, in a variety of sports and competition, responsible for enforcing the rules of the sport, including sportsmanship decisions such as ejection. The official tasked with this job may be known by a variety of other titles depending on the sport, including umpire, judge, arbiter, commissaire, or technical official (by the International Olympic Committee). Referees may be assisted by linesmen, timekeepers, touch ju

thumb|200px|A sumo , the , in full traditional dress

Ringside judges in sumo