- ZSO stands for Zoroastrian Society of Ontario (est. 1971; Ontario, Canada)
- ZSO stands for Zveza Slovenskih Organizacij (Slovenian: Association of Slovenian Organizations)
- ZSO stands for Zelda’s Secret Ocarina (website)
- ZSO stands for Open Limit Switch (control systems)
- ZSO stands for Zwols Symfonie Orkest (Dutch: Zwols Symphony Orchestra; Olst-Wijhe, Netherlands)
- ZSO stands for Zemaitijos Skautu Organizacija (Lithuanian: Samogitia Scouts Organization)
Abbreviations And Their Meaning