Leo Apostyppes or Apostoupes (Greek: Λέων ὁ Ἀποστύππης/Ἀποστούπης) was a Byzantine military leader active in the 880s. He appears in 880, as military governor (strategos) of the themes of Macedonia and Thrace, leading the troops of these two provinces in campaign in southern Italy. The expedition was commanded by the protovestiarios Prokopios, which possibly indicates that Apostyppes was sent to Italy as reinforcement of the original expedition. The expedition, supported by a fleet under Nasar, was initially successful in its operations to recover the cities of Calabria, but the dual command of the land forces proved fatal when Apostyppes and Prokopios quarreled: during a battle Prokopios found himself in danger, but Apostyppes refused to send troops to his aid, with the result that Prokop