| Abbreviation | Definition |
|---|---|
| OWC | Officers Wifes' Club |
| OWC | Officers Wives Club |
| OWC | The Officers Wifes Club |
| OWEC | Oakville Wine Enthusiasts Club |
| OWL | Older Womens' League |
| OXFC | Old Xaverians Football Club |
| OYBC | Ohio Young Birders Club |
| OYC | Oakmont Yacht Club |
| OYC | Oceanside Yacht Club |
| OYC | Olympia Yacht Club |
| OYC | Olympic Yacht Club |
| OYC | Orleans Yacht Club |
| OYC | Oshkosh Yacht Club |
| OYC | Outrigger Yacht Club |
| OYC | Ozark Yacht Club |
| OZC | Official Zelda Club |
| PA | Procrastinators Anonymous |
| PAAC | Piedmont Asian American Club |
| PAAC | Pioneer Alumni Archery Club |
| PACC | Philadelphia Aviation Country Club |