- CAAO stands for Consortium of African American Organizations
- CAAO stands for Center for Astronomical Adaptive Optics (University of Arizona)
- CAAO stands for County Auditors’ Association of Ohio (Columbus, OH)
- CAAO stands for Connecticut Association of Assessing Officers (Hartford, CT)
- CAAO stands for Congress of Arab American Organizations (est. 2001)
- CAAO stands for China Appointed Attesting Officer (Hong Kong)
CAAO