Ousmane Dabo (born 8 February 1977 in Laval, Mayenne) is a French football midfielder who currently plays for S.S. Lazio.

He has previously played for Rennes, Internazionale, Vicenza, Parma, Monaco, Atalanta, Lazio and Manchester City. He has represented France three times at full international level. His younger brother, Moussa, is currently without a club and also plays as a midfielder.

Dabo started his career at Rennais.