Ousman Koli (born 18 October 1988) is a Gambian retired footballer who played as a defender.
Born in Bakau, Koli began his career in 2001 with Bakau United and joined their league rivals Steve Biko in 2003.
In August 2011, he signed a contract with Slovenian second tier side à  enÃÂur.
In February 2012, Koli joined Slovenian top flight team Triglav Kranj.
Koli was a member of the Gambia under-17 team that won the 22 July Peace Tournament, held in Banjul in 2003. He was also included in the squad that won the first-ever international trophy for Gambia, when the team hosted and won the 2005 African U-17 Championship.
He debuted for the senior team in 2007 in a match against Guinea.