HAO


AcronymDefinition
HAOHigh Altitude Observatory (US National Center for Atmospheric Research)
HAOHigh Availability Option
HAOHome Address Option
HAOHamilton, Ohio (Airport Code)
HAOHospice Association of Ontario
HAOHumanitarian Affairs Officer
HAOHealth Action Overseas
HAOHuman Appeal Organization
HAOHumanitarian Assistance Operation
HAOHaute Activité Oxyde (French: High Activity Oxide)