| Acronym | Definition |
|---|
| ZSO➣Zoroastrian Society of Ontario (est. 1971; Ontario, Canada) |
| ZSO➣Zveza Slovenskih Organizacij (Slovenian: Association of Slovenian Organizations) |
| ZSO➣Zelda's Secret Ocarina (website) |
| ZSO➣Open Limit Switch (control systems) |
| ZSO➣Zwols Symfonie Orkest (Dutch: Zwols Symphony Orchestra; Olst-Wijhe, Netherlands) |
| ZSO➣Zemaitijos Skautu Organizacija (Lithuanian: Samogitia Scouts Organization) |