The Treaty of Constantinople ends the 16-year-long First Ottoman–Venetian War.

The Treaty of Constantinople was signed on 25 January 1479, which officially ended the sixteen-year-long war between the Republic of Venice and the Ottoman Empire. The Venetians were forced to hand over Scutari in Albania and the island of Lemnos and the Mani Peninsula in Greece; and acknowledge the loss of Negroponte (Euboea) and Croia. The treaty allowed a full restoration of Venetian trading privileges in the Ottoman Empire against an annual flat tax of 10,000 ducats, as well as a 100,000 ducats in arrears owed by Venetian citizens to the Porte.

The First Ottoman–Venetian War was fought between the Republic of Venice with its allies and the Ottoman Empire from 1463 to 1479. Fought shortly after the capture of Constantinople and the remnants of the Byzantine Empire by the Ottomans, it resulted in the loss of several Venetian holdings in Albania and Greece, most importantly the island of Negroponte (Euboea), which had been a Venetian protectorate for centuries. The war also saw the rapid expansion of the Ottoman navy, which became able to challenge the Venetians and the Knights Hospitaller for supremacy in the Aegean Sea. In the closing years of the war, however, the Republic managed to recoup its losses by the de facto acquisition of the Crusader Kingdom of Cyprus.

January 25 is the 25th day of the year in the Gregorian calendar; 340 days remain until the end of the year.