Mykhailo Spyrydonovych Melnyk (Ukrainian: Миха́йло Спиридо́нович Ме́льник; 14 March 1944, Ordyntsi, Pohrebyshche Raion, Vinnytsia Oblast, USSR – 10 March 1979, Pohreby, Brovary Raion, Kiev Oblast, USSR) was Ukrainian historian, poet, human rights activist, dissident and member of Ukrainian Helsinki Group.