Alexios Mosele (Greek: Ἀλέξιος Μωσηλέ) or Musele/Mousele (Μουσελέ) was a Byzantine aristocrat and general, chosen by Emperor Theophilos (r. 829–842) for a time as his heir, betrothed to his daughter Maria and raised to the supreme dignity of Caesar. He campaigned in the Balkans, recovering territory from the Slavs, and fought with some success in Sicily against the Arabs. Recalled to Constantinople on suspicion of plotting to usurp the throne, he was imprisoned but later pardoned and allowed to retire to a monastery, where he spent the remainder of his days.