thumb|St. Thomas' Church in Prague, the burial place of Butautas
Butautas (baptized Henryk; died on May 7, 1380, in Prague) was a son of Kęstutis, Grand Duke of Lithuania. He attempted to depose his uncle Algirdas and usurp power in Lithuania, but failed and was forced into exile.
Butautas' son Jonas Vaidutis in 1401 became the Rector of the Jagiellonian University in Kraków.
The first reliable data comes from summer of 1365. While Algirdas and Kęstutis were in Volhynia helping their brother Liubartas in the Galicia–Volhynia Wars, Butautas together with other nobles attempted a coup d'état. However, the plans were discovered by Dirsūnas, deputy of Vilnius. Butautas was arrested, but his accomplice or brother Survila rescued him and killed Dirsūnas. Two Bishops, John of Warmia and Bartholomew of Sambia were summoned for the ceremony, also attended by English crusaders, including Earl of Warwick and Thomas Ufford. In August, he led a Teutonic raid deep into Lithuania reaching as far as Vilnius and Vilkmergė.
Family
It is known that Butautas left one son, Jonas Vaidutis, in Lithuania. He also emigrated to the West in 1381 at the age of sixteen. Jonas Vaidutis died in 1402.