This is a list of the treaties and agreements signed during the history of the Eastern Roman or Byzantine Empire. The definition of a treaty is any agreement between the Byzantine Empire and any foreign power, including peace agreements, trade agreements, and understandings between the two powers. For external conflicts see Byzantine wars.

Constantinian dynasty (306–363)

Valentinian–Theodosian dynasty (364–457) Peace of Acilisene (387) – Peace treaty between Sassanid Empire and Eastern Roman Empire, dividing Greater Armenia in half.

Leonid dynasty (457–518)

Justinian dynasty (518–602) Eternal Peace (532), between the Byzantines and Sassanid Persia Fifty-Year Peace Treaty (562) – between Byzantines and Sassanid Persia

Non-dynastic (602–610)

Heraclian dynasty (610–711)

Non-dynastic (711–717) Byzantine–Bulgarian Treaty of 716 – Officially ends the Battle of Anchialus and establishes the borders between Byzantium and the Bulgarian Empire.

Isaurian dynasty (717–802)

Nikephoros' dynasty (802–813) Pax Nicephori (803) peace treaty between Charlemagne and Nicephorus I

Non-dynastic (813–820) Byzantine–Bulgarian Treaty of 815 with the Bulgarian Empire.

Amorian dynasty (820–867)

Macedonian dynasty (867–1056) Rus'–Byzantine Treaty (907) Rus'–Byzantine Treaty (911) Rus'–Byzantine Treaty (945) Treaty of Safar (970) Byzantine–Georgian treaty of 1022 Byzantine–Georgian treaty of 1031

Non-dynastic (1056–1057)

Komnenian dynasty (1057–1059)

Doukid dynasty (1059–1081)

Byzantine–Norman treaty of 1074 with Robert Guiscard

Komnenian dynasty (1081–1185) Byzantine–Venetian Treaty of 1082 Treaty of Devol (1108) with Bohemond I of Antioch Treaty of Antioch (1137) with Raymond of Poitiers

Angelid dynasty (1185–1204)

Laskarid dynasty (Empire of Nicaea, 1204–1261) Treaty of Nymphaeum (1214) Nicaean–Venetian Treaty of 1219 Nicaean–Latin Armistice of 1260 Treaty of Nymphaeum (1261)

Palaiologan dynasty (1261–1453)

Byzantine–Venetian treaty of 1268 Byzantine–Venetian treaty of 1277 Byzantine–Trapezuntine treaty of 1282 Byzantine–Venetian treaty of 1285 Byzantine–Venetian treaty of 1302 Byzantine–Venetian treaty of 1310 Byzantine–Venetian treaty of 1324 Treaty of Chernomen (1327) Byzantine–Venetian treaty of 1332 Byzantine–Aydinid alliance (1335) Byzantine–Venetian treaty of 1342 Byzantine–Venetian treaty of 1357 Byzantine–Venetian treaty of 1363 Byzantine–Venetian treaty of 1370 Byzantine–Venetian treaty of 1376 Byzantine–Venetian treaty of 1390 Treaty of Gallipoli (1403) – agreement that released the Byzantine Empire of vassalage to the Ottoman Empire and extensive territorial additions. Byzantine–Venetian treaty of 1406 Byzantine–Venetian treaty of 1412 Byzantine–Venetian treaty of 1418 Byzantine–Venetian treaty of 1423 Byzantine–Venetian treaty of 1431 Byzantine–Venetian treaty of 1436 Byzantine–Venetian treaty of 1442 Byzantine–Venetian treaty of 1448

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