Denver Roller Derby (DRD) is a flat-track roller derby league based in Denver, Colorado. The league was founded in December 2005. Denver Roller Derby is a member of the Women's Flat Track Derby Association (WFTDA), joining in December 2007 as Denver Roller Dolls. In January 2015, the league changed its name to Denver Roller Derby.

Rocky Mountain Roller Derby (RMRD) is a flat-track roller derby league based in Denver, Colorado. Founded in 2004, Rocky Mountain is a founding member of the Women's Flat Track Derby Association (WFTDA), and has qualified for WFTDA Playoffs every year, including winning the WFTDA Championships in 2010.