| 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) |