Douglas Alan Mathis (born June 7, 1983) is a former professional baseball pitcher and current pitching coach with the Los Angeles Dodgers organization for their Triple–A affiliate in Oklahoma City.

Previously he was a coach in the Seattle Mariners, Toronto Blue Jays and Texas Rangers organizations.

[1] In 2006, Mathis played for the Advanced A Bakersfield Blaze and was California League Pitcher of the Week twice.

In 2007, he was Texas League Pitcher of the Week twice and was a mid-season all-star for the AA Frisco RoughRiders.

[2] Mathis began the 2008 season with the AAA Oklahoma City RedHawks and was called to the majors in May.

Mathis moved to the Toronto Blue Jays organization in 2019, as the pitching coach of the Buffalo Bisons.