Luke Barker (born March 11, 1992) is an American professional baseball pitcher for the Milwaukee Brewers of Major League Baseball (MLB).
Barker grew up in Chico, California, and attended Pleasant Valley High School. He played college baseball at Chico State for four seasons. Barker was named first-team All-California Collegiate Athletic Association (CCAA) and first-team Division II All-American after setting a school record with 18 saves as a junior and repeated as an All-CCAA selection after going 4–3 with a 1.73 ERA in 11 starts as a senior.
Barker was undrafted in the 2015 MLB draft and signed with the Traverse City Beach Bums of the independent Frontier League. He was signed by the Milwaukee Brewers on November 28, 2016.
In 2017, Barker was assigned to the Class A Wisconsin Timber Rattlers before earning a promotion to the Class A-Advanced Carolina Mudcats. He returned to Carolina for the 2018 season and was named the Carolina League Relief Pitcher of the Year after going 6–4 with 20 saves and a 2.21 ERA.
Barker was assigned to the Double-A Biloxi Shuckers to begin the 2019 season, where he posted a 1.48 ERA over 23 appearances and was named a Southern League All-Star before being promoted to the Triple-A San Antonio Missions. Barker returned to Triple-A with the Nashville Sounds for the 2021 season.
Barker has never divulged any information about his parents, he is a very private person who likes to keep his personal life away from media attention.