Mason-Dixon Roller Vixens (MDRV) is a women's flat track roller derby league based in Hagerstown, Maryland, and a member of the Women's Flat Track Derby Association (WFTDA).

Mason-Dixon Roller Vixens was established in June 2007, and initially practiced in Greencastle, Pennsylvania.

[3] Several of them broke off to form Key City Roller Derby, a league in Frederick, Maryland.

[4] Key City Roller Derby dissolved in 2016 and several of its remaining members joined MDRV.

Mason-Dixon was accepted into the Women's Flat Track Derby Association Apprentice Program in April 2010,[5] and became a full member in March 2012.