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| OYRLL | Old York Road Little League | |
| OYS | Pine Mountain Lake Airport, Yosemite National Park, California USA | |
| OYS | On Your Site | |
| OYS | On Your Side | |
| OYS | Ohio Youth Sailing school | |
| OYS | Ocean Yacht Systems | |
| OYS | OYSter | |
| OYS | Office of Youth Services | |
| OYS | Oregon Youth Summit | |
| OYS | Ohio Youth Symphony | |
| OYS | Ohio Youth Sailing | |
| OYS | Ohio Youth Sailing | |
| OYS | Omnipotent Youth Society | |
| OYS | Ontario Youth Sports | |
| OYS | Orinda Youth Sports | |
| ÖYS | Ögrenci Yerlestirme Sinavi | |
| OYS | Outstanding Young Scientist | |
| OYS | Oulun Yliopistollinen Sairaala | |
| OYS | Own Your Story | |
| OYS | Oakville Yacht Squadron | |
| OYS | Ontario Youth Sports | |
| OYS | Omnipotent Youth Society | |
| OYS | Operation Youth Success | |
| OYS | Older Youth Services | |
| OYS | Orinda Youth Sports |
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