Arthur Frank Warren (born March 23, 1993) is an American professional baseball pitcher who is a free agent.

[2] Warren made his professional debut with the Arizona League Mariners and pitched seven innings for them, giving up three runs and striking out ten.

[10][9][11] He made his major league debut on September 12 versus the Cincinnati Reds, pitching a scoreless 1⁄3 of an inning.

[17] On September 24, it was announced that Warren had undergone surgery to repair UCL damage in his throwing elbow.

[21] He returned to action in 2024, making 28 appearances split between the Single–A Tampa Tarpons and Triple–A Scranton/Wilkes-Barre RailRiders and accumulating an 8.51 ERA with 35 strikeouts across 30+2⁄3 innings pitched.