Tr?nh Sâm (??, 9 February 1739 – 13 September 1782) ruled northern Vietnam from 1767 to 1782 AD.
He ruled with the title "Tinh Ðô Vuong", and was one of the last of the powerful Tr?nh lords.
Tr?nh Sâm defeated the ancient enemy of the northern state, the Nguy?n lords in the south.
The Tr?nh line was separate from the royal Lê Dynasty, and the officially recognized king was Lê Hi?n Tông (1740–1786), who continued to occupy the royal throne in Thang Long (modern-day Hanoi), but without real power.