Ðoan Nam Vuong Tr?nh Kh?i (ch? Hán: ??, 1763-1786) was one of the Tr?nh lords in northern Vietnam.
He fought against the armies of the infant Tr?nh Cán to win leadership of the northern warlords (reigning 29 November 1782 - July 1786), but was himself defeated by the southern warlord, later emperor Nguy?n Hu?.
Tr?nh Kh?i later committed suicide.
He was succeeded by the last of the lords, Tr?nh B?ng.