Cory Steven Blaser
- Height 6' 0", Weight 178 lb.
Cory Blaser began umpiring professionally in 2002 and umpired his first major league game in 2010, as a fill-in umpire. He was assigned to the Pacific Coast League until 2013, while working a total of 346 big league games as a fill-in. He was promoted to the status of full-time major league umpire before the 2014 season.