| Acronym | Definition |
|---|
| OSTA➣Optical Storage Technology Association |
| OSTA➣Osteoporosis Self-Assessment Tool for Asians |
| OSTA➣Office of Space and Terrestrial Applications (US NASA; now OAST) |
| OSTA➣Old Spanish Trail Association |
| OSTA➣Open Standard Telecom Architecture (hardware platform) |
| OSTA➣Occupational Skill Testing Authority (China) |
| OSTA➣Ohio State Trappers Association (est. 1940) |
| OSTA➣Oklahoma Science Teachers Association (Stillwater, OK) |
| OSTA➣Oberlin Student Theater Association (Oberlin College; Ohio) |
| OSTA➣Oregon Substitute Teachers Association |