Mikhailo Aleksandrovich Olelkovich (executed on August 30, 1481 in Vilnius) was a Ruthenian noble from the Olelkovich family of the Grand Duchy of Lithuania. He was the brother of Prince Simeon Olelkovich of Kiev and cousin of Grand Prince Ivan III of Moscow. Mikhailo was allegedly involved both in bringing the Judaizer Heresy to Novgorod and the failed defection of the city to the Grand Duchy of Lithuania in 1471. He also organized a coup against Casimir IV Jagiellon, King of Poland and Grand Duke of Lithuania, but was discovered and executed in 1481. Mikhailo's son Semen continued the family line.