The Byzantine–Venetian treaty of 1285 was an agreement between the Byzantine Empire and the Republic of Venice that restored peaceful relations between the two powers.
After the outbreak of the War of the Sicilian Vespers in 1282, Charles' ambitions to capture Constantinople were dealt a fatal blow; with economic troubles arising from her exclusion from the commerce and grain shipping from the Black Sea, in 1283 Venice began negotiations for a treaty with the new Byzantine emperor, Andronikos II Palaiologos.
It repeated the terms of the two previous treaties, often verbatim, but had a much longer duration of ten years.
It restored the right of Venetians to trade in the Empire, with direct access to the Black Sea and the right to their own quarters in Constantinople and Thessalonica, recognized the position of Venice's rivals, the Republic of Genoa, in the Empire, and bound both sides to not enter into alliances with powers hostile to the other.
As part of the deal, Andronikos paid over a lump sum to satisfy Venetian claims for compensation for breaches of the previous treaties.