Luke William Barker (born March 11, 1992) is an American former professional baseball pitcher.

[1] 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.

In 2017, Barker was assigned to Single-A Wisconsin Timber Rattlers before earning a promotion to the High-A Carolina Mudcats.

[3] 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.

[6] On June 1, Barker was optioned back down to Nashville without making an appearance for the Brewers, giving him the distinction of being a phantom ballplayer.