HSA

HSA may refer to:

Organizations

 * Hellenic Space Agency, Greece
 * Haiku Society of America
 * Harvard Student Agencies
 * Hawker Siddeley Aviation
 * Hayel Saeed Anam Group, a Yemeni conglomerate
 * Health Sciences Authority, Singapore
 * Health and Safety Authority, Ireland
 * Hmar Students' Association, in Imphal, Manipur, India
 * HSA Bank, US
 * Hunt Saboteurs Association, UK
 * Hospital Saving Association, UK, now Simplyhealth

Schools

 * The Harlem School of the Arts

Science

 * Heat stable antigen, a protein
 * Human serum albumin

Transportation

 * 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

 * Health savings account, US
 * Health Spending Account, Canada
 * Healthcare Spending Account, Canada
 * Heterogeneous System Architecture, in computing
 * HSA Foundation
 * Homeland Security Act, US
 * Sultanah Aminah Hospital, Johor, Malaysia
 * Host State Act (Switzerland)