Seth Antonio Martinez (born August 29, 1994) is an American professional baseball pitcher for the Houston Astros of Major League Baseball (MLB). From Sierra Vista, Arizona, Martinez attended Arizona State University and played college baseball for the Sun Devils. The Oakland Athletics selected Martinez in the 17th round of the 2016 MLB draft. Martinez remained in the Oakland organization until the Astros selected him in the 2020 Rule 5 draft, and he made his MLB debut in 2021.