Hassan Vossug ed-Dowleh[2][3][4] (Persian: حسن وثوق‌الدوله‎; April 1, 1868 – February 3, 1951) was an Iranian politician who served as the Prime Minister of Iran twice.

Vossug's mother died when he was young, after which he was cared for by an uncle while his father worked as a financial manager in several provinces of Iran.

Vossug was elected as a founding member and deputy president of the inaugural National Consultative Assembly (Majles) of Iran in 1906.

Vossug played a leading role in negotiations that resulted in the 1919 Anglo-Persian Agreement, which led to allegations that he had been bribed by the British.

Although Vossug denied that he had enriched himself personally and also offered to repay the money,[5] his reputation was so damaged that he left Iran.