Asterius the Sophist (Ἀστέριος; died c. 341) was an Arian Christian theologian from Cappadocia. Few of his writings have been recovered in their entirety (latest edition by Markus Vinzent). He is said to have been a pupil of Lucian of Antioch, but it is unclear to what extent this was the case. Fragments of his Syntagmation are preserved by Athanasius of Alexandria and Marcellus of Ancyra.
His extant works include a commentary on the Psalms, a letter to Eusebius, the Syntagmation, and a few fragments.
Asterius was a firm defender of Arianism and Eusebius of Caesarea's theology, emphasising the derivative nature of the Son as a spontaneous manifestation and generation of the Father's will.