Soter derives from the Greek epithet σωτήρ (sōtēr), meaning a saviour, a deliverer; initial capitalised Σωτήρ; fully capitalised ΣΩΤΗΡ; feminine Soteira (Σώτειρα) or sometimes Soteria (Σωτηρία).
Soter was used as:
- as a title of gods: Poseidon Soter, Zeus Soter, Dionysus Soter, Apollo Soter, Hades Soter, Helios Soter, Athena Soteira, Asclepius Soter, and Hecate Soteira.
- as the name of a distinct mythical figure, Soter (daimon)
- any heroized or deified leaders of Hellenistic dynasties, see Hellenistic ruler cult:
- as a title of liberators (see also eleutherios (disambiguation)
- a title of Jesus of Nazareth, most particularly in the fish acronym
- Pope Soter, r. ca. 167-174.