League

• USA
• Madison Roller Derby

Mad Rollin' Dolls are currently known as Madison Roller Derby.

• USA
• Madison Roller Derby

Mad Rollin' Dolls are currently known as Madison Roller Derby.

• Men's Derby
• Spain
• MadRiders Roller Derby

MadRiders roller derby is a play on "Madrid-ers", since the league is based in Madrid, Spain.

• Maine Roller Derby

• UK
• Need better picture
• Men's Derby
• Manchester Roller Derby

• UK
• Manchester Roller Derby

• UK
• Need better picture
• Manchester Roller Derby

The Furies are the B-team of Manchester Roller Derby.

• UK
• Manchester Roller Derby

• UK
• Manchester Roller Derby

• USA
• Mankato Area Derby Girls

• Belgium
• Men's Derby
• Manneken Beasts

• UK
• Disbanded
• Mansfield Roller Derby

uk

• USA
• Back Patch
• Mason-Dixon Roller Vixens

• USA
• Anniversary
• Mason-Dixon Roller Vixens

• USA
• Need better picture
• Men's Derby
• Massachusetts Men's Roller Derby

• USA
• Maui Roller Girls

• UK
• Men's Derby
• Disbanded
• Mayhem Men's Roller Derby

• USA
• MedCity Mafia Roller Derby

• Australia
• Melbourne Northside Rollers

• USA
• Memphis Roller Derby

• Need better picture
• Men's Derby
• National Team
• Men's Roller Derby Italy
• Italy

• Metropolitan Roller Derby
• Chile

The Cannibales Dolls are (were?) a home team of Metropolitan Roller Derby in Chile.

• Mexico
• Mexico City Roller Derby

• USA
• Mid Atlantic Roller Derby

• USA
• Mid Atlantic Roller Derby

• USA
• Midstate Mayhem Roller Derby

• UK
• Milton Keynes Roller Derby

The Concrete Cows are the travel team for Milton Keynes Roller Derby.

• USA
• Milwaukee Roller Derby

As near as I can tell, the Brewcity Bruisers are the travel team of Milwaukee Rollergirls (currently Milwaukee Roller Derby).

• USA
• Men's Derby
• Minnesota Men's Roller Derby

• USA
• Minnesota Roller Derby