Alexios III may refer to:
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Alexios III Angelos (c. 1153–1211), Emperor of the Byzantine Empire
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Alexios III of Trebizond
Alexios III Megas Komnenos ( el, Αλέξιος Μέγας Κομνηνός, 5 October 1338 – 20 March 1390), or Alexius III, was Emperor of Trebizond from December 1349 until his death. He is perhaps the best-documented ruler of that country, ...
(1338–1390), Emperor of Trebizond
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