Petras Mantigirdaitis (Polish: Piotr Montygerdowicz; died 1459) was an influential Lithuanian noble that was the Grand Marshal of Lithuania (1434–59).
He supported the 1432 coup against Švitrigaila and commanded troops of Sigismund Kęstutaitis in the Lithuanian Civil War (1431–35).
The name or origin of the first wife is unknown; they had one son Jonas, who was not active in politics and possibly died young.
[2] His second wife was Anna, daughter of Feodor, son of Kaributas and grandson of Grand Duke Algirdas.
His main estate was in Iwye in present-day Grodno Region, Belarus (it was granted to him in 1434 by Sigismund Kęstutaitis, but it could have been a confirmation of his patrimonial rights).