KKK is an initialism (or a three-letter abbreviation) referring to the following organizations:

• The Ku Klux Klan (sometimes incorrectly called the Klu Klux Klan) is a white supremacy organization in the United States.
• The Kataastaasang Kagalanggalangang Katipunan ng mga Anak ng Bayan, or Katipunan for short, the largest revolutionary group that fought for the independence of the Philippines from Spain.
• Kühnle Kopp und Kausch http://www.agkkk.de/english/index.htm is a German group of industrial firms. They have been known to stamp "KKK" on their products.

The letters "KKK" (for Ku Klux Klan) are also used in alternative political spellings.