| Samuel O'banner F, Bethune-Cookman Wildcats |
| Larry O'bannon F, Louisville Cardinals |
| Beau O'quin G, Nicholls State Colonels |
| Derrick Obasohan F, Texas-Arlington Mavericks |
| Nosa Obasuyi C, Radford Highlanders |
| Jesse Obrand F, UC Irvine Anteaters |
| Matt Ochs F, Nevada Wolf Pack |
| Stanley Ocitti F, Binghamton |
| Marvin Oconnor G, St. Joseph's Hawks |
| Jon Oden F, DePaul Blue Demons |
| Jarrad Odle F, Indiana Hoosiers |
| Josh Odugbela F, Hartford Hawks |
| Kwame Ofori G, Navy Midshipmen |
| King Ogbogu C, Cornell Big Red |
| Chris Ogden F, Texas Longhorns |
| Anthony Oglesby G, New Hampshire Wildcats |
| Emeka Okafor F, Connecticut Huskies |
| Patrick Okafor F, Houston Cougars |
| Matt Okoro F, UC Irvine Anteaters |
| Reggie Okosa F, LaSalle Explorers |
| Vincent Okotie F, Liberty Flames |
| Brandon Okpalobi G, Miami (FL) Hurricanes |
| Patrick Okpwae F, American Eagles |
| Akimbola Okunrinboye G, San Jose State Spartans |
| Bo Olaiya C, Texas-Arlington Mavericks |
| John Olinger G, Portland State Vikings |
| Jay Oliphant F, Sam Houston State Bearkats |
| Chrismen Oliver G, Santa Barbara Gauchos |
| John Oliver F, West Virginia Mountaineers |
| Jonathan Oliver G, Southern Jaguars |
| Marcus Oliver G, Houston Cougars |
| Xavier Oliver F, Alabama State Hornets |
| Patrick Omalley F, Richmond Spiders |
| Ed Oneil G, Charleston Southern Buccaneers |
| Rory Oneil C, Southern California Trojans |
| Mike Oneill C, Drake Bulldogs |
| Ugonna Onyekwe F, Pennsylvania Quakers |
| Joost Ooms C, Binghamton |
| Earv Opong G, Albany NY Great Danes |
| Shawn Opunui G, Brigham Young Cougars |
| Mike Orfini G, Stony Brook Seawolves |
| Denis Orlov C, Virginia Commonwealth Rams |
| Stalin Ortiz G, Valparaiso Crusaders |
| Andy Osborn F, Loyola-Marymount Lions |
| Clayton Osborn G, Lipscomb |
| Chris Osborne F, Arizona State Sun Devils |
| Jason Osborne F, Dayton Flyers |
| Ryan Osborne G, IUPUI Jaguars |
| Danny Osby G, Chicago State Cougars |
| Martin Osimani G, Utah Utes |
| Alex Osipovitch F, Western Carolina Catamounts |
| Vedad Osmanovic F, Dartmouth Big Green |
| Eric Osmundson G, Utah Utes |
| Steve Othoro C, Baylor Bears |
| Nick Otis G, Belmont Bruins |
| Karim Ouattara F, Albany NY Great Danes |
| Jay Overcash C, Drexel Dragons |
| Brandon Owens G, Monmouth (NJ) Hawks |
| Chris Owens F, Texas Longhorns |
| Freddie Owens G, Wisconsin Badgers |
| Kevin Owens C, Monmouth (NJ) Hawks |
| Leonard Owens F, Texas-El Paso Miners |
| Robert Owens F, Ball State Cardinals |
| Stevin Ozier F, Stephen F. Austin Lumberjacks |