Brennan Miller (born 1991) is an American professional baseball umpire who began his Major League Baseball career in 2019 and joined the permanent staff in 2023. He wears uniform number 55.

After graduating from the MiLB Umpire Academy in 2013, Miller began working as an umpire in Minor League Baseball. He umpired in the New York-Penn League, Florida Instructional League, Florida State League, Arizona Instructional League, Southern League, and the International League. Miller umpired is first game in Major League Baseball in 2019. As a call-up umpire in 2019, Miller was involved in a profanity-laced argument with New York Yankees manager Aaron Boone. Following a called third strike to Brett Gardner and strike one call to DJ LeMahieu, Miller ejected Boone for continuing to argue after he warned him. MLB would later suspend Boone for one game for making contact with Miller during the tirade.^[1]

MLB promoted him to the permanent staff in 2023 after a record-high ten MLB umpires retired following the 2022 season.^[2]

• List of Major League Baseball umpires

• Retrosheet