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| O4S | Open Four Seater | |
| O4U | Only For You | |
| O5 | Overseer Level 5 | |
| O5 | Officer grade: Commander or Lieutenant Colonel | |
| O5 | Österreich (Austrian) Resistance Group | |
| O6 | Officer grade: Captain or Colonel | |
| O69 | Petaluma Municipal Airport, Petaluma, California USA | |
| O7 | Officer grade: Commodore, Rear Admiral (Lower Half), or Brigadier General | |
| O7W | Oh Why Oh Why Oh Why Oh Why Oh Why Oh Why Oh Why | |
| O8 | Officer grade: Rear Admiral (Upper Half), or Major General | |
| O8-) | Starry-eyed angel | |
| O81 | Tulelake Municipal Airport, Tulelake, California USA | |
| O88 | Paradise Skypark, Paradise, California USA | |
| O9 | Officer grade: Vice Admiral or Lieutenant General | |
| O:-) | Angel | |
| OA | Open Architecture | |
| OA | Operational Architecture | |
| OA | Original Artist | |
| OA | Object Address | |
| OA | Order of Australia | |
| OA | Open an Account | |
| OA | Obstructive Apnoea | |
| OA | Occipital Artery | |
| OA | Occiput Anterior | |
| OA | odontoameloblastoma |
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