Gabriel Bethlen (de Iktár) (Hungarian: Bethlen Gábor, Romanian: Gabriel Bethlen, German: Gabriel Bethlen von Iktár November 15, 1580-November 15, 1629) is a prince of Transylvania (1613-1629), duke of Opole (1622-1625) and leader of an anti-Habsburg insurrection in the Habsburg Royal Hungary.

His last armed intervention in 1626 is part of the Thirty Years' War.

He leads an active Protestant-oriented foreign policy.