- DSAO stands for Du Sud a l’Ouest (French: South West; architecture firm)
- DSAO stands for Down Syndrome Association of Ontario (Ottawa, Ontario, Canada)
- DSAO stands for Driving School Association of Ontario (est. 1975; Canada)
- DSAO stands for Disabled Sailing Association of Ontario (Canada)
- DSAO stands for Drainage Superintendents Association of Ontario (Canada)
- DSAO stands for Diploma in Small Animal Orthopaedics (UK)
- DSAO stands for Design Structuring and Allocation Optimization
DSAO