| Last Name | Full Name | Attended | Graduated? | E-mail Address |
| O'Berry Jr. | Andrew Preston O'Berry Jr. | 41 to 43 | ? | |
| O'Brien | Hayden Scott O'Brien* | 58 | ||
| O'Brien | John Edmund O'Brien | 66 to 68 | 68 | |
| O'Donnell | Terry O'Donnell | 67 | ||
| O'Donnell | William Terrance O'Donnell | 63 to 65 | 65 | wto65@hotmail.com |
| O'Kain | Lee Roberts O'Kain | 27 | ||
| O'Keefe | Maurice O'keefe | 39 | ||
| O'Saile | Charles Murrey O'Saile | 61 to 62 | 62 | |
| O'Steen | John D. O'Steen | 45 | ||
| O'Steen | John Daniel O'Steen | 43 to 45 | ? | |
| Oakes | Jack Oakes | 44 | ||
| Oakes | John William Oakes | 42 to 44 | ? | |
| Oakley | John Richard Oakley | 45 to 48 | 48 | Drjohnoakley@aol.com |
| Oakley | Walter W. Oakley | 56 | ||
| Oates | Forrest Charles Oates | 27 | ||
| Oates | Richard Walter Oates | 55 to 61 | 61 | |
| Oates | Robert William Oates* | 55 to 61 | 61 | |
| Odom | William Eldridge Odom* | 49 to 50 | 50 PG | |
| Off | Robert Wardlow Orr Jr. | 72 to 76 | 76 | |
| Oftedal | Robert Gustave Oftedal | 37 to 38 | 38 PG | |
| Ogburn | Robert Stephen Ogburn | 67 to 69 | ? | |
| Ogburn Jr. | William Ellis Ogburn Jr. | 65 to 67 | 67 | |
| Ogilvie | Rufus R. Ogilvie | 26 | ||
| Ogle | Charles Earl Ogle | 33 to 38 | 38 | ceogle@aol.com |
| Ogle | Thomas Austin Ogle* | 49 | ||
| Ogle III | Dave Ogle III* | 70 to 74 | 74 | |
| Ogle Jr. | Charles Earl Ogle Jr. | 56 to 58 | 58 | |
| Ogles | Lemyuel E. Ogles | 65 NG | ||
| Okel | James Muir Okel | 46 to 49 | ? | |
| Old | Dodge Patterson Old | 67 to 70 | 70 | |
| Oliver | James Barry Oliver | 59 to 62 | 62 | |
| Oliver | James Stanley Oliver | 60 to 61 | 61 | |
| Oliver | Ollie Oliver | 62 | ||
| Olswanger Jr. | David Melvin Olswanger Jr. | 42 to 45 | 45 | |
| Opalack | Gerald Henry Opalack | 62 to 63 | 53 | |
| Orgill | Edmond Orgill | 17 to 18 | 18 | |
| Orman | Jack Shannon Orman | 55 to 64 | 64 | |
| Orman | Robert Campbell Orman | 41 to 43 | 43 | |
| Orman | William Tanner Orman | 55 to 61 | 61 | wtorman@epbfi.com |
| Ormes | Jack Ormes | 44 | ||
| Orr | Bob Orr | 76 | ||
| Orr | Carl Robert Orr* | 67 to 72 | 72 | |
| Orr | Jake Kittrell Orr | 13 to 14 | 14 | |
| Orr Jr. | Gilbert Mac Williams Orr Jr. | 53 to 55 | 55 | |
| Ortega | Mario Elias Ortega | 75 to 77 | 77 | |
| Osborne | William Warren Osborne | 65 to 66 | 66 PG | |
| Ostrich | Nathan Somon Ostrich | 42 to 44 | 44 | |
| Owen | H.E. Owen | Faculty | Faculty | |
| Owen Jr. | Sydney Bergin Owen Jr. | 49 to 51 | 51 | |
| Owen Sr. | Robert Lee Owen* | 42 to 45 | 45 | |
| Owens | Nicholas Joseph Owens | 67 to 68 | 68 PG | |
| Owens Jr. | Robert Sanford Owens Jr. | 47 to 49 | 49 | |
| Ozier Jr. | Charles M. Ozier Jr. | 49 to 52 | 52 | cmojr@bellsouth.net |