There are four national trade union centers in Turkey. The oldest and largest is the Confederation of Turkish Trade Unions (TÜRK-İŞ).
- Confederation of Turkish Trade Unions (TÜRK-İŞ, founded 1952, 1.75m members)
- Confederation of Revolutionary Trade Unions of Turkey (DİSK, founded 1967, 327,000 members)
- Confederation of Turkish Real Trade Unions (HAK-İŞ, founded 1976, 340,000 members)
- Confederation of Public Workers' Unions (KESK, founded 1995, 300,000 members)
Some unions, such as the KESK-affiliated education union Eğitim-Sen, have witnessed repeated attempts on banning and member imprisonment.