SAK can stand for:
- Saif Ali Khan, an Indian actor and producer
- Central Organisation of Finnish Trade Unions (Suomen Ammattiliittojen Keskusjärjestö in Finnish)
- Secure attention key
- Søren Aaybe Kierkegaard, philosopher
- Swiss Army knife
- SAK Comedy Lab, an Improvisational Comedy Theater in Orlando, Florida known for the place of discovery for actor Wayne Brady
- Studien zur Altägyptischen Kultur, an academic Egyptological journal