HSA may refer to:

Finance and medicine HSA Bank, US Health savings account, US Healthcare Spending Account, Canada Hospital Saving Association, UK, now Simplyhealth Sultanah Aminah Hospital, Johor, Malaysia Health Sciences Authority, Singapore Health and Safety Authority, Ireland Heat stable antigen, a protein Human serum albumin

Education Harvard Student Agencies Hmar Students' Association, in Imphal, Manipur, India The Harlem School of the Arts

Transportation Hellenic Space Agency, Greece Hawker Siddeley Aviation East African Safari Air, by ICAO code Harry Stern Airport, in Richland County, North Dakota, US Stennis International Airport, in Bay St. Louis, Mississippi, US, FAA airport code High Speed Amphibian, an amphibious vehicle created by Alan Gibbs

Other uses Heterogeneous System Architecture, in computing HSA Foundation Homeland Security Act, US Host State Act (Switzerland) Haiku Society of America Hayel Saeed Anam Group, a Yemeni conglomerate Hunt Saboteurs Association, UK

See also HSAS (disambiguation)