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| Old Swedish (Maeva) | |||
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| Office of Solid Waste; Office of Saline Water; Office of Solid Wastes; Overrated Shitty Wrestling | |||
| Outside World (semfromshire); oblique shock wave | |||
| optical switch; optimum support warranty | |||
| Open Systems World | |||
| one-side welding | |||
| Objective Sniper Weapon (US Army) | |||
| Official Scrabble Words; Old School Wrestling | |||
| Oley Sled Works; One-Stop Wholesaler; Outer Space Wetworks | |||
| Operations Short of War (military operations other than war (MOOTW) focus on deterring war, resolving conflict, promoting peace, and supporting civil authorities in response to domestic crises S3_OPS) | |||
| Orsk, Russia | |||
| operational switching unit | |||
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| Oswego | |||