The Greenbelt Municipal Swim Team (GMST) has been in existence since 1957 and is a charter member of the Prince-Mont Swim League (PMSL). GMST is a Division B team in the Prince-Mont Swim League.

GMST swims competitively in the summer season, mid June through the first week of August, at both home and away weekly meets with other Division B teams.

GMST also offers Fall-Winter/Spring Swim Programs for their swimmers.

See GMST in action this past summer.