NKA

NKA may refer to:

• "Now known as"
• "No known allergies" in medical jargon
• Initialism for North Korean Army, also known as the Korean People's Army
• Na⁺/K⁺-ATPase, an enzyme located in the plasma membrane in all animals
• Karate Canada, previously the "National Karate Association" of Canada
• New Kosovo Alliance, a political party
• Neurokinin A, a neurologically active peptide that seems to be involved in reactions to pain and the inflammatory responses