Alexios Doukas Philanthropenos (Greek: Ἀλέξιος Δούκας Φιλανθρωπηνός, died c. 1275) was a Byzantine nobleman and distinguished admiral, with the rank of protostrator and later megas doux, during the reign of Michael VIII Palaiologos (r. 1259–1282).
He first appears in George Akropolites's history in autumn 1255 as a military commander in the region of Ohrid — perhaps as doux (governor) of the local thema (province) — during the wars of Theodore II Laskaris (r. 1254–1258) against the Bulgarians.
The Byzantines raided and sacked the islands of Paros, Naxos, and Keos, as well as the towns of Karystos and Oreoi on Negroponte (Euboea), before sailing south to support the operations of an expeditionary force that landed at Monemvasia against the Principality of Achaea.
[6] During the early 1270s, Philanthropenos led his fleet several times against the Latins, supporting Licario, an imperial vassal, in Negroponte, and participating in the great Byzantine naval victory at the Battle of Demetrias, during which he was heavily wounded.
Their second son was the pinkernes Alexios Philanthropenos the Younger, a prominent general who scored several successes against the Anatolian Turks, and who led an unsuccessful rebellion against Andronikos II Palaiologos (r. 1282–1328) in 1295.