Leo Argyros (Greek: Λέων Ἀργυρός) was a Byzantine aristocrat and general active in the first decades of the 10th century.
According to Constantine VII Porphyrogennetos, already in 911, Leo, despite his youth, became military governor (strategos) of the theme of Sebasteia, with the rank of protospatharios.
[5] Leo and a younger brother, Romanos, participated in the campaign against Bulgaria that ended in the disastrous Battle of Achelous on 20 August 917.
[2][5] Under Romanos I Lekapenos (r. 920–944), Leo reached the highest offices and attained the ranks of patrikios and eventually magistros.
[3] In April 922 he commanded, along with his brother Pothos, who was then Domestic of the Schools, the rhaiktor John, and the droungarios of the imperial fleet Alexios Mosele, the army that confronted a Bulgarian raid under the kavkhan Menikos, that had reached the outskirts of Constantinople.