KSA is a three-letter acronym which may mean:

• Kingdom of Saudi Arabia
• Korea Science Academy
• Korea Scout Association
• King Sunny Adé
• King's South Africa Medal for service in the Boer War
• Sydney Airport
• Knowledge Skills and Abilities
• Kosher Supervision of America
• [(Kool Sunday Apples)]
• IATA Airport Code for Kosrae International Airport
• KSA (Underwater) Ltd, a firm who (as at February 2008) make the Subskimmer
• The RC4 key scheduling algorithm

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