KOS may refer to:

• Knowledge of Self, a precept of the Five-Percent Nation

• Knowledge Organization Systems

• KOS Media, Kent, England

• KOS (Yugoslavia), counterintelligence service

• KOS (Serbia)

• Kingdom of Sweden

• Kosovo (UNDP code: KOS), a partially recognized state in Southeastern Europe

• Sihanouk International Airport, Cambodia (IATA code: KOS)

See also

• Kos (disambiguation)

• k-os