Posted in Business & Finance, Government & Military, Organizations, Schools & Education, Science 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)