Charles Oakley 1985-86 to 2003-04
Charles O'Bannon 1997-98 to 1998-99
Ed O'Bannon 1995-96 to 1996-97
Fabricio Oberto 2005-06 to 2010-11
J.J. O'Brien 2015-16
Johnny O'Bryant 2014-15 to 2017-18
Patrick O'Bryant 2006-07 to 2009-10
Daniel Ochefu 2016-17
Greg Oden 2008-09 to 2013-14
Lamar Odom 1999-00 to 2012-13
Josh Oduro 2025-26
Alan Ogg 1990-91 to 1992-93
Tim Ohlbrecht 2012-13
Semi Ojeleye 2017-18 to 2021-22
Emeka Okafor 2004-05 to 2017-18
Jahlil Okafor 2015-16 to 2024-25
Toby Okani 2025-26
Chuma Okeke 2020-21 to 2024-25
Elie Okobo 2018-19 to 2019-20
Josh Okogie 2018-19 to 2025-26
Onyeka Okongwu 2020-21 to 2025-26
Mike O'Koren 1980-81 to 1987-88
Isaac Okoro 2020-21 to 2025-26
KZ Okpala 2019-20 to 2022-23
Mehmet Okur 2002-03 to 2011-12
Victor Oladipo 2013-14 to 2022-23
Hakeem Olajuwon 1984-85 to 2001-02
Mark Olberding 1976-77 to 1986-87
Lachlan Olbrich 2025-26
Jawann Oldham 1980-81 to 1990-91
Frank Oleynick 1975-76 to 1976-77
Quincy Olivari 2024-25
Brian Oliver 1990-91 to 1997-98
Cameron Oliver 2020-21 to 2021-22
Dean Oliver 2001-02 to 2002-03
Jimmy Oliver 1991-92 to 1998-99
John Olive 1978-79 to 1979-80
Kevin Ollie 1997-98 to 2009-10
Michael Olowokandi 1998-99 to 2006-07
Kelly Olynyk 2013-14 to 2025-26
Norchad Omier 2025-26
Eugene Omoruyi 2021-22 to 2023-24
Jermaine O'Neal 1996-97 to 2013-14
Royce O'Neale 2017-18 to 2025-26
Shaquille O'Neal 1992-93 to 2010-11
Miye Oni 2019-20 to 2021-22
Arinze Onuaku 2013-14 to 2016-17
Chinanu Onuaku 2016-17 to 2017-18
Kyle O'Quinn 2012-13 to 2019-20
Louis Orr 1980-81 to 1987-88
Jose Ortiz 1988-89 to 1989-90
Daniel Orton 2011-12 to 2013-14
Cedi Osman 2017-18 to 2023-24
Greg Ostertag 1995-96 to 2005-06
Dan O'Sullivan 1990-91 to 1995-96
Matt Othick 1992-93
Daniel Oturu 2020-21 to 2021-22
Kelly Oubre Jr. 2015-16 to 2025-26
Bo Outlaw 1993-94 to 2007-08
Travis Outlaw 2003-04 to 2013-14
Doug Overton 1992-93 to 2003-04
Andre Owens 2005-06 to 2007-08
Billy Owens 1991-92 to 2000-01
Chris Owens 2002-03
Eddie Owens 1977-78
Jim Owens 1973-74 to 1974-75
Keith Owens 1991-92
Larry Owens 2010-11 to 2011-12
Tariq Owens 2019-20
Tom Owens 1976-77 to 1982-83
Ray Owes 1996-97
Olumide Oyedeji 2000-01 to 2002-03