Alekna Sudimantaitis (Belarusian: Алехна Судзімонтавіч, Polish: Olechno Sudymuntowicz; died in 1490/1491) was an influential Lithuanian noble of Trąby coat of arms, Grand Chancellor of the Grand Duchy of Lithuania (1478–1490) and Voivode of Vilnius (1477–1490).
[1] In 1482, a brevis from Pope Sixtus IV to launch a new crusade against the Ottoman Turks was addressed to Alekna and Martynas Goštautas, Voivode of Trakai.
From Grand Duke Casimir, Alekna received Smalyavichy, Voŭpa, Ostroshitsy (Belarusian: Астрошыцы).
[1] He funded an altar inside a chapel of Vilnius Castle Complex, where his wife Jadvyga was buried.
[4] He was a son of Sudimantas Dargaitis and second cousin of Mikalojus Radvila the Old (see family tree in Astikai).