"the waterer"
- In Greek mythology, one of the Hesperides
- A nymph, daughter of Nereus (making her a Nereid), Arethusa ran from a suitor, Alpheus, the river god, making her way to Sicily. Artemis changed her into a fountain. Alpheus swam underground and mingled his waters with hers.
Arethusa occasionally appeared on coins as a young girl with a net in her hair and fish around her head.