The Gray City Rebels (GCR) is a women's flat track roller derby league based in São Paulo, Brazil. Founded in 2010, the league consists of a single travel team, which competes against teams from other leagues, and is a member of the Women's Flat Track Derby Association (WFTDA).

History The league was founded in December 2010 as Sao Paulo's second flat track roller derby league."A liga ", Gray City Rebels Four skaters from the league competed for Roller Derby Brasil at the 2011 Roller Derby World Cup.Cassio Barco, "Cheio de carisma, time de Roller Derby de SP mira 'Libertadores'", Globo.com, 23 April 2013

By mid-2012, Gray City Rebels had about thirty skaters, and had brought experienced skaters from the United States to run training camps.Jéssika Torrezan, "Roller Derby ganha primeiros times na capital", Veja São Paulo, 13 July 2012 In January 2013, it was accepted as a member of the Women's Flat Track Derby Association Apprentice Program."WFTDA Accepts 16 Apprentice Members ", WFTDA, 31 January 2013 Gray City became a full member of the WFTDA in January 2016.

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