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Alexios I Komnenos or Alexius I Comnenus (Greek: Αλέξιος Α' Κομνηνός, Alexios I Komnēnos; Latin: ALEXIVS I COMNENVS; 1048 – August 15, 1118), Byzantine emperor (1081–1118), was the son of John Komnenos and Anna Dalassena and the nephew of Isaac I Komnenos (emperor 1057–1059). The military, financial and territorial recovery of the Byzantine Empire known as Komnenian restoration began in his reign.

Alexios' father declined the throne on the abdication of Isaac, who was accordingly succeeded by four emperors of other families between 1059 and 1081. Under one of these emperors, Romanos IV Diogenes (1067–1071), he served with distinction against the Seljuk Turks. Under Michael VII Doukas Parapinakes (1071–1078) and Nikephoros III Botaneiates (1078–1081) he was also employed, along with his elder brother Isaac, against rebels in Asia Minor, Thrace and in Epirus.