In fourth century Christianity, the Anomœans, also known as Anomeans, Heterousians, Aëtians, or Eunomians, are a sect of Arians who assert that Jesus of Nazareth (the Son) was of a different nature and in no way like to that of God (the Father).

They believe that the opinions of Arius, as he originally expressed them, were correct, but reject his later confessions, which he adopted in order to be readmitted into the Church.The word Anomœan comes from Greek 'not' and 'similar', i.e., "different; dissimilar".

In the 4th century, during the reign of Constantius II, this is the name by which the followers of Aëtius and Eunomius are distinguished as a theological party; they not only deny the consubstantiality of Jesus but even assert that he was of a nature different from that of God.

This is in contradistinction to the semi-Arians, who indeed deny the consubstantiality of Jesus, but believe at the same time that he is like the Father.