Zbigniew Oleśnicki; December 5, 1389 in Sienno, Masovian Voivodeship – April 1, 1455), known in Latin as Sbigneus, is a high-ranking Roman Catholic clergyman and an influential Polish statesman and diplomat.

He serves as Bishop of Kraków from 1423 until his death in 1455.

He takes part in the management of the country's most important affairs, initially as a royal secretary under King Władysław II Jagiello and later as the effective regent during King Wladyslaw III's minority.

In 1449 he becomes the first native Polish cardinal.