The Treaty of Nagyvárad, (February 24, 1538), was a secret peace agreement between King Ferdinand I and the Ottomans. John Zápolya is recognized as King of Hungary, while Ferdinand retains the western parts of the Hungarian Kingdom, and is recognized as heir to the Hungarian throne.

According to treaty, Hungarian kingdom was divided. Ferdinand took one-third of western part, and John Zápolya was left remaining two-thirds. Ferdinand was designated to succeed Zapolya, after his death. Hovewer, a little before Zápolya's death, his wife born him a son, John II Sigismund Zápolya. Zápolya died in 1540, and John Sigismund was recognized as King of Hungary by Hungarian national party. Ottoman sultan Suleyman the Magnificent also recognized John Sigismund as King, and also as his vassal.

Nagyvárad is now Oradea, Romania.

1538 | Treaties in the history of Hungary | History of Croatia | Ottoman Empire