明道加斯（Mindaugas，约1200年—1263年9月12日）是目前已知的第一位立陶宛大公和唯一的立陶宛国王。 明道加斯的出身、早年生活和权力上升的过程至今无人知晓；不过在一份1219年的条约中，他作为一位上等公爵被提及，在1236年的一份文献中，他又被提及为全立陶宛人的首领；而且当时和现代的文献论及他的夺权之路时，都提到其至关重要的婚姻和对敌人的流放与谋杀。1230年代和1240年代，他将其统治版图向立陶宛本部的东南方延伸。1250年和1251年，在国内权力斗争时，明道加斯昄依罗马天主教；此举也使他得以与利沃尼亚骑士团，这一立陶宛人长期的敌人结盟。1253年夏，他获得加冕，成为立陶宛国王，统治着30万到40万子民。

Mindaugas (German:Myndowen, Latin:Mindowe, Old East Slavic:Мендог — Mendog, Belarusian:Міндоўг or Mindoūh, c. 1203 – fall 1263) was the first known Grand Duke of Lithuania and the only King of Lithuania. Little is known of his origins, early life, or rise to power; he is mentioned in a 1219 treaty as an elder duke, and in 1236 as the leader of all the Lithuanians. The contemporary and modern sources discussing his ascent mention strategic marriages along with banishment or murder of his rivals. He extended his domain into regions southeast of Lithuania proper during the 1230s and 1240s. In 1250 or 1251, during the course of internal power struggles, he was baptised as a Roman Catholic; this action enabled him to establish an alliance with the Livonian Order, a long-standing antagonist of the Lithuanians. During the summer of 1253 he was crowned King of Lithuania, ruling between 300,000 and 400,000 subjects.