In baseball, the umpire is the person charged with officiating the game, including beginning and ending the game, enforcing the rules of the game and the grounds, making judgment calls on plays, and handling disciplinary actions. The term is often shortened to the colloquial form ump. They are also sometimes nicknamed blue due to the traditional color of the uniform worn by umpires. Although games were often officiated by a sole umpire in the formative years of the sport, since the turn of the 20th century, officiating has been commonly divided among several umpires, who form the umpiring crew. The position is analogous to that of a referee in many other sports.
James Bremond Evans is an American former umpire in Major League Baseball (MLB) who worked in the American League (AL) from 1971 to 1999, and ran a professional umpiring school from 1990 through 2012.
Dale Allan Scott is an American former umpire in Major League Baseball. He worked in the American League from 1986 to 1999, and officiated in both leagues from 2000 until his retirement after the 2017 season. He became a crew chief in 2001. He wore uniform number 39 his first two years and number 5, previously worn in the AL by Russ Goetz, thereafter.
Jose Alexander Cora is a Puerto Rican baseball manager and former infielder who is the manager of the Boston Red Sox in Major League Baseball (MLB). He previously played in MLB for 14 seasons with the Red Sox, Los Angeles Dodgers, Cleveland Indians, New York Mets, Texas Rangers, and Washington Nationals. After retiring as a player, Cora served as the bench coach for the Houston Astros when they won their first World Series title in 2017. Cora was named Boston's manager the following season, winning a franchise-best 108 games and leading the team to victory in the 2018 World Series. He is the fifth MLB manager to win the World Series in his first season and the first Puerto Rican manager of a World Series-winning team.
Douglas Leon Eddings is an American professional umpire in Major League Baseball.
Dana Andrew DeMuth is a former umpire in Major League Baseball.
Alfonso Márquez is a Mexican umpire in Major League Baseball (MLB) who worked in the National League in 1999 and has worked throughout both major leagues since 2000. He was promoted to crew chief for the 2020 season, becoming the first full time Latino-born crew chief. Márquez wears uniform number 72, a number he shared with friend and National Hockey League linesman Stéphane Provost.
Mark Patrick Wegner is an American Major League Baseball umpire. He worked in the National League from 1998 to 1999, and throughout both major leagues since 2000. He was promoted to Crew Chief for the 2018 MLB season when Dale Scott retired after the 2017 MLB season.
James Patrick Hoye is an American umpire in Major League Baseball. He wears number 92. Hoye worked as an MLB reserve umpire from 2003 to 2009 for both the American and National Leagues. He was hired to the full-time Major League staff prior to the 2010 season. Hoye has worked two All-Star Games, two World Series, three League Championship Series, five Division Series, and five Wild Card Games/Series. He was promoted to crew chief in 2023.
John Francis Tumpane is an American Major League Baseball umpire, who wears number 74.
Carlos Torres Nuldis is a Venezuelan professional umpire in Major League Baseball (MLB). He made his major league debut in 2015.
Stuart Jeffrey Scheurwater is a Canadian Major League Baseball (MLB) umpire. He made his MLB debut on April 25, 2014, and was hired to the full-time staff in December 2017.
Ramon Silvestre De Jesus Ferrer is a Dominican professional baseball umpire. He made his Major League Baseball (MLB) debut on April 22, 2016, thus becoming the first MLB umpire from the Dominican Republic. De Jesus wears number 18, which was most previously worn by former umpire Marcus Pattillo.
Nicolas James Lentz is an American umpire in Major League Baseball. He made his debut on April 20, 2016, in Miami. He wears number 59, which was most recently worn by former umpire Jon Byrne.
Jon Stephen Byrne is an Australian former Major League Baseball (MLB) umpire. He made his debut on 16 May 2014, becoming the first MLB professional umpire to have been born in Australia. Australian second baseman Joe Quinn had acted as a substitute umpire for two National League games; one each in 1894 and 1896.
Benjamin Joseph May is an American umpire in Major League Baseball (MLB). He has worked in MLB since 2014, and wears number 97.
John Libka is a Major League Baseball umpire.
Ryan Blair Additon is an American umpire in Major League Baseball. After graduating from Lynn University, he pitched one season for the Kalamazoo Kings of the Frontier League. He wears uniform number 67.
Sean Michael Barber is an American professional baseball umpire in Major League Baseball (MLB). He began working in MLB as a call-up umpire in 2014 and was hired as a full-time umpire before the 2022 season.
Erich Bacchus is an American professional baseball umpire. He has been an umpire in Major League Baseball since 2020 and was promoted to the full-time umpiring staff in 2023. Bacchus wears uniform number 12.
