SAK or sak can stand for: Central Organisation of Finnish Trade Unions (Suomen Ammattiliittojen Keskusjärjestö in Finnish) Finnish Federation of Trade Unions, forerunner of the Central Organisation of Finnish Trade Unions Secure attention key SAK Comedy Lab, an Improvisational Comedy Theater in Orlando, Florida, United States Steve Kaufman, nickname given by his mentor Andy Warhol Swiss Army knife Studien zur Altägyptischen Kultur, an academic Egyptological journal The IATA airport code for Sauðárkrókur Airport, Skagafjörður, Iceland ISO 639-2 (alpha-3) code for the Shake or Sake language, spoken in Gabon Siumut Amerdlok Kunuk, a football and handball club in Greenland