List of doping cases in sport (O)

This is a sub-list from List of doping cases in sport representing a full list of surnames starting with O.

Name	Country	Event	Banned substance(s)	Reference(s)
Kirk O'Bee	United States	Cycling	Testosterone	[1]
Robbie O'Davis	Australia	Rugby league	Anabolic steroids	[2][3][4]
Chiedozie Offiah	United Kingdom	Basketball	Test tampering	[5]
Stuart O'Grady	Australia	Cycling	EPO (Self admit)	[6]
Reza Ojagh	Iran	Swimming	Nandrolone	[7]
Mirela Olczak	Poland	Swimming	Methylhexaneamine	[8]
Olena Olefirenko	Ukraine	Rowing		[9]
Ruslan Oleksenko	Ukraine	Wrestling	THC	[10]
Andrey Oleynik	Ukraine	Swimming	Cannabis	[11]
Jacques Oliger	Chile	Weightlifting		[12]
Achiliev Olimbeck	United Arab Emirates	Weightlifting	Metandienone	[13]
Victor Felipe Silveira Oliveira	Brazil	Volleyball	Steroids	[14]
Graham Olling	Australia	Rugby league	Anabolic steroids	[15]
Larry Olubamiwu	United Kingdom	Boxing		[16]
Naiij Omid	Iran	Weightlifting	Metandienone	[13]
Esther Omosehin	Nigeria	Swimming	Ephedrine	[17]
André Onana	Cameroon	Football (soccer)	Furosemide	[18]
Qazi Onik	Bangladesh	Cricket	Methamphetamine	[19]
Nathan O'Neill	Australia	Cycling	Phentermine	[20]
Elizabeth Onuah	Nigeria	Weightlifting	Hydrochlorothiazide, Amiloride	[13]
Oo Mya Sanda	Myanmar	Weightlifting	Metabolite	[21]
Niusila Opeloge	Samoa	Weightlifting		[13]
Omar Ortiz	Mexico	Football (soccer)	Oxymetholone, masteron	[22]
Michal Orzechowski	Poland	Wrestling	THC	[10]
Ronnie O'Sullivan	England	Snooker	Cannabis	[23]
Bilal Othman	Syria	Weightlifting		[13]
Bilikis Otunla	Nigeria	Weightlifting	Nandrolone	[13]
Abdelkrim Ouakali	Algeria	Wrestling	Furosemide	[24]
Ouyang Kunpeng	China	Swimming	Clenbuterol	[25]
Artem Ovechkin	Russia	Cycling		[26]
Alistair Overeem	Netherlands	MMA and Kickboxing	Testosterone- Epitestosterone	[27]
Mita Overvliet	Netherlands	Weightlifting	Norandrosterone, Furosemide	[13]
Henry Owens	United States	Baseball	Performance-enhancing substance	[28]