John Mitchell McMillon (born January 27, 1998) is an American professional baseball pitcher in the Philadelphia Phillies organization.

He has previously played in Major League Baseball (MLB) for the Kansas City Royals and Miami Marlins.

He did not sign with Tampa and played college baseball at Texas Tech University.

[2] After going undrafted in the 2020 MLB draft, McMillon signed with the Kansas City Royals on June 23, 2020.

[3] He made his professional debut in 2021 with Single-A Columbia, later being promoted to the High-A Quad Cities River Bandits.