Posted in Business & Finance, Engineering, Government & Military, Health & Medicine, Organizations, Schools & Education CaO stands for Calcium Oxide CaO stands for Central Applications Office (student placements in Irish universities) CaO stands for Chief Administrative Officer (corporate title) CaO stands for Conception Assistée par Ordinateur (French: Computer-Aided Design) CaO stands for County Administrative Officer CaO stands for Collectieve Arbeidsovereenkomst (Dutch) CaO stands for Chief Accounting Officer (job title) CaO stands for Chief Academic Officer CaO stands for County Assistance Office (Pennsylvania) CaO