Han har spillet for [[Stade Rennais FC|Rennes]], [[F.C. Internazionale Milano|Internazionale]],<ref>{{cite news | title=Fulham eye Dabo|work=BBC  | url=http://news.bbc.co.uk/sport1/hi/football/teams/f/fulham/2043619.stm| accessdate=5. april 2015 | date=13. juni 2002}}</ref> [[Vicenza Calcio|Vicenza]], [[Parma F.C.|Parma]], [[AS Monaco FC|Monaco]], [[Atalanta B.C.|Atalanta]], [[S.S. Lazio|Lazio]],<ref>{{cite web|url=http://www.uefa.com/uefachampionsleague/news/newsid=82816.html|title=Lazio pounce for Atalanta pair|date=18. juli 2003|accessdate=5. april 2015 |publisher=UEFA.com}}</ref> [[Manchester City F.C.|Manchester City]]<ref name=Lazio>{{cite news | title=Dabo quits Lazio to join Man City | url=http://news.bbc.co.uk/sport1/hi/football/teams/m/man_city/5100914.stm |publisher=BBC Sport   | date=21. juni 2006 | accessdate=5. april 2015 }}</ref> og [[New England Revolution]].<ref>{{cite news| url=http://www.boston.com/sports/soccer/articles/2011/02/08/dabo_set_to_join_revolution/ | work=The Boston Globe | first=Frank | last=Dell'Apa | title=Dabo set to join Revolution | date=8. februar 2011}}</ref> Han har repræsenteret [[Frankrigs fodboldlandshold]] tre gange på internationalt niveau. Ousmane Dabo har en yngre bror, [[Moussa Dabo|Moussa]], der også er professionel fodboldspiller, der dog er uden klub pt..
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