Petras Jonaitis Mangirdaitis

Petras Jonaitis Mantigirdaitis (; died after 1497) was a prominent Lithuanian noble. Grandson of Petras Mantigirdaitis, he first appeared in written sources in 1476 and reached his career high in the 1490s, when he was Voivode of Trakai (1490–97) and Grand Marshal of Lithuania (1491–97).