Piotr Opaliński (1586– 17 January 1624), of Łodzia coat of arms, was a Polish–Lithuanian noble (szlachcic).
The son of Jan Opaliński and Barbara z Ostroroga Lwowska, he studied in a Jesuit collegium in Poznań, later in Ingolstadt and Padua (around 1604).
After visiting Rome, returned to Polish–Lithuanian Commonwealth in 1605 and took part in the Sejm of 1606.
His total wealth near the end of his life was 3 towns and 50 villages.
He is one of the figures on the Prussian Homage painting by Jan Matejko.