鄭主
Điện Đô Vương Trịnh Cán (, 1777 – 17 December 1782) was a child heir of northern Vietnam's Trịnh lords and the ninth Trịnh lord. His mother was Đặng Thị Huệ who undertook a war to retain his place as lord, but her armies were defeated by warlord Trịnh Khải. He was born and died in Thang Long (now Hanoi).