Mikhailo Olelkovich
| Mikhailo Olelkovich | |
|---|---|
| Prince of Kopyl | |
| Reign | 1443–1481 |
| Predecessor | Olelko Vladimirovich |
| Successor | Simeon II |
| Prince of Slutsk | |
| Reign | 1454–1481 |
| Predecessor | Simeon Olelkovich |
| Successor | Simeon II |
| Prince of Novgorod | |
| Reign | 1470–1471 |
| Died | August 30, 1481 Vilnius |
| Issue | Simeon Mikhailovich Slutsky |
| Family | Olelkovich branch of Gediminids |
| Father | Aleksandras Olelka |
| Mother | Anastasia Vasilievna |
| Religion | Eastern Orthodox |
Mikhailo or Mikhail Olelkovich (Russian: Михаил Олелькович; died August 30, 1481) was a noble from the Olelkovich family of the Grand Duchy of Lithuania who served as the appanage prince of Kopyl and Slutsk. He was the younger brother of Simeon Olelkovich, the prince of Kiev, and a cousin of Ivan III, the grand prince of Moscow. Mikhailo was allegedly involved both in bringing the Judaizers to Novgorod and the failed defection of the city's nobles to the Grand Duchy of Lithuania in 1471. He also organized a coup against Casimir IV Jagiellon, the king of Poland and grand duke of Lithuania, but was discovered and executed in 1481. Mikhailo's son Simeon continued the family line.