The Mason-Dixon Roller Vixens (MDRV) is a roller derby league based in Hagerstown, Maryland. Founded in 2007, the league consists of a single team which competes against teams from other leagues.
The league was established in June 2007, and initially practiced in Greencastle, Pennsylvania. Initially, the league had only eight skaters, but this increased to twenty by mid-2009. Several skaters from the league were founder members of Key City Roller Derby.