Posted in Engineering, Information Technology, Organizations 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)