List of empresses of the Byzantine successor states

This is a list of the consorts of the four main Byzantine Greek successor states of the Byzantine Empire following the Fourth Crusade in 1204 and up to their conquest by the Ottoman Empire in the middle of the 15th century. These states were Nicaea, Trebizond, Epirus, and the Morea. The last two never actually claimed the imperial title, except briefly under Theodore Komnenos Doukas in the late 1220s, who began as ruler of Epirus but crowned himself emperor in Thessalonica.