Theodore Palaiologos or Palaeologus (), can refer to:
Theodore Palaiologos (son of Michael VIII) (c. 1263 – after 1310), Byzantine prince and general Theodore I, Marquess of Montferrat (c. 1291–1338), Marquess of Montferrat in 1306–1338 Theodore I Palaiologos (c. 1355–1407), Despot of the Morea in 1383–1407 Theodore II, Marquis of Montferrat (died 1418), Marquess of Montferrat in 1381–1418 Theodore II Palaiologos (c. 1396–1448), Despot of the Morea in 1407–1443 Teodoro Paleologo di Montferrato (1425–1484), Catholic bishop Theodore Palaiologos (stratiote) (1452–1532), stratiote in the service of Venice Theodore Paleologus (c. 1560–1636), alleged descendant of Thomas Palaiologos Theodore Paleologus (Junior) (1609–1644), son of Theodore Paleologus Theodorious Paleologus (c. 1660–1693), grandson of Theodore Paleologus Theodore Palaeologo (c. 1823–1912), 19th-century pretender to the throne of Greece
See also Theodore Kantakouzenos (d. 1410), Theodore Palaiologos Kantakouzenos