Naim Khan, 41, Mohammed Nazir, 44, and Raheem Ahmed, 42, were found guilty of 35 offences, including rape and indecent assault, against the girl when she was aged between 13 and 15.
Oxford Crown Court heard the victim was “treated as a sexual commodity for the use of older men” from 1999 to 2001.
Naim Khan, 41, formerly of Herschel Crescent, Littlemore, Oxford, OX4 3, was also convicted of indecently assaulting a second girl.
He was found guilty of eight counts of rape, seven counts of indecent assault and one count of supplying a Class B drug.
Mohammed Nazir, 44, formerly of Wood Farm Road, Headington, Oxford, OX3 8, was convicted of seven counts of rape, eight counts of indecent assault and one count of supplying a Class B drug.
Raheem Ahmed, 42, formerly of Starwort Path, Blackbird Leys, Oxford, OX4 6, was found guilty of two counts of indecent assault and one count of supplying a Class B drug.