| OSSA | Oregon State Shooting Association | 俄勒冈州射击协会 |
| OSSA | Ontario Speed Skating Association | 安大略省速滑协会 |
| OSSA | Oregon School Safety Association | 俄勒冈州学校安全协会 |
| OSSA | Official State Secrets Act (Great Britain) | 《官方国家机密法》（英国） |
| OSSA | Open Secure Storage Area | 打开安全存储区域 |
| OSSA | Occupational Surveillance Scheme for Audiological Physicians | 听力医生职业监测计划 |
| OSSA | Office of Space Science and Applications | 空间科学和应用办公室 |
| OSSA | Office of Space Science and Applications (NASA) | 空间科学与应用办公室（NASA） |
| OSSA | On- Site Service Agreement | 现场服务协议 |
| OSSA | Ontario Service Safety Alliance (Toronto, Ontario, Canada) | 安大略服务安全联盟（加拿大安大略省多伦多） |
| OSSA | Office of Space Sciences and Applications | 空间科学与应用办公室 |
| OSSA | Operational Support System Architecture | 作战支持系统架构 |
| OSSA | Ocean Surveillance Aircraft | 海洋监视飞机 |