The Treaty of Selymbria was concluded between the Republic of Venice and the Ottoman prince Musa Çelebi.

The Treaty of Selymbria was an agreement concluded on 3 September 1411 between the Republic of Venice and the Ottoman prince Musa Çelebi, ruler of the European portion of the Ottoman Empire (Rumelia), at Selymbria. The treaty largely repeated previous agreements between Venice and Ottoman rulers, and recognized the possessions of the Republic in Greece and Albania.

The Republic of Venice, officially the Most Serene Republic of Venice and traditionally known as La Serenissima, was a sovereign state and maritime republic with its capital in Venice. Founded, according to tradition, in 697 by Paolo Lucio Anafesto, over the course of its 1,100 years of history it established itself as one of the major European commercial and naval powers. Initially extended in the Dogado area, during its history it annexed a large part of Northeast Italy, Istria, Dalmatia, the coasts of present-day Montenegro and Albania as well as numerous islands in the Adriatic and eastern Ionian seas. At the height of its expansion, between the 13th and 16th centuries, it also governed Crete, Cyprus, the Peloponnese, a number of Greek islands, as well as several cities and ports in the eastern Mediterranean.

The Ottoman Empire, also called the Turkish Empire, was an imperial realm that controlled much of Southeast Europe, West Asia, and North Africa from the 14th to early 20th centuries; it also controlled parts of southeastern Central Europe, between the early 16th and early 18th centuries.

Musa Çelebi was an Ottoman prince and a co-ruler of the empire for three years during the Ottoman Interregnum.