On October 1, 1998,Enciclopédia do Futebol Brasileiro, Volume 1 – Lance, Rio de Janeiro: Aretê Editorial S/A, 2001. the club was founded as Guaratinguetá Esporte Clube by a group including Doctor Mário Augusto Rodrigues Nunes (nicknamed Marinho). Club history at Guaratinguetá Futebol's official website
