Trịnh Tạc (Hán: 鄭柞; 11 April 1606 – 24 September 1682) ruled northern Dai Viet in 1657–1682. Trịnh Tạc was one of the most successful of the Trịnh lords who ruled Bắc Hà. During his rule, he made peace with the Nguyễn, ending the long war. Trịnh Tạc also captured the last small province of Dai Viet ruled by the Mạc Dynasty.