O
| Player | No.(s) | Height in Ft. | Position | Years for Rockets | School/Club Team/Country |
|---|---|---|---|---|---|
| Oakley, Charles Charles Oakley | 33 | 6-9 | Forward | 2004 | Virginia Union |
| Olajuwon, Hakeem Hakeem Olajuwon | 34* | 7-0 | Center | 1984-2001 | Houston |
| Oldham, Juwann Jawann Oldham | 51 | 7-0 | Center | 1981-82 | Seattle |
| Owens, Tom Tom Owens | 25 | 6-10 | Forward / Center | 1976-77 | South Carolina |
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