Justin Michael Hampson (born May 24, 1980) is an American former professional baseball pitcher.

He played in Major League Baseball (MLB) for the Colorado Rockies, San Diego Padres and New York Mets.

On February 16, 2011, Hampson signed a minor league contract with the New York Mets.

On June 25, 2012, he was called up by the Mets after Vinny Rottino was designated for assignment.

Following the season, Hampson was outrighted off the Mets' 40-man roster, and he declared free agency.