OSZ
| Acronym | Definition |
|---|---|
| OSZ | Open Source Zambia (online community information resource; Zambia) |
| OSZ | Odborove Sdruzeni Zeleznicaru (Czech: Railway Workers Union; Prague, Czech Republic) |
| OSZ | Outaouais Ski Zone (Canada) |
| OSZ | Operation Spam Zombies (US FTC and others) |
| OSZ | Order of the Sisters of Zathras |
| OSZ | Organisation Secrète Zéro (French) |