KKK is an initialism (or a three-letter abbreviation) referring to the following organizations:
- The Ku Klux Klan is an extremist white supremacy organization in the United States.
- The Kataastaasang Kagalanggalangang Katipunan ng mga Anak ng Bayan (Tagalog for Exalted and Venerable Society of the Sons of the Nation), or Katipunan for short, is the largest revolutionary group that fought for the independence of the Philippines from Spain.