SAK

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