KSA is the Kingdom of Saudi Arabia.
KSA or Ksa may also refer to:
Arts and media
- KSA-TV, Alaska, US
- Kirby Star Allies, a 2018 video game
Aviation
- Kosrae International Airport (IATA airport code), Federated States of Micronesia
- Kingsford-Smith Airport or Sydney Airport, Australia
Computing
- Key-scheduling algorithm, in cryptography
- Kogge–Stone adder
Organisations
- Kenya Scouts Association
- Kommando Strategische Aufklärung (Strategic Reconnaissance Command), a German intelligence organization
- Korea Scout Association
- Korean Standards Association
- Kosher Supervision of America
Schools
- Korea Science Academy, Busan, South Korea
- Ohio State University Knowlton School of Architecture, housed in Knowlton Hall
Other uses
- Ksa (spirit), a Native American Lakota and Oglala spirit of wisdom
- King's South Africa Medal, a medal for service in the Boer War
- Knowledge, Skills, and Abilities, on US government job applications
- KSA, a kölsch-style ale by Fort Point Beer Company