| Acronym | Definition |
|---|
| OSSD | Ontario Secondary School Diploma |
| OSSD | Oss Default |
| OSSD | Organization for the Study of Sex Differences (Washington, DC) |
| OSSD | Open Source Sports Directory (resource) |
| OSSD | Opportunistic Software Systems Development (various organizations) |
| OSSD | Open Software Service Definition (FOSS) |
| OSSD | Office of Space Systems Development (NASA) |
| OSSD | Digor (linguistics) |
| OSSD | Operations Support Services Division (San Jose Police Department; California) |
| OSSD | Output Signal Switch Device |
| OSSD | Optical and Space Systems Division |