In Greek mythology, Arethusa (/ˌærɪˈθjuːzə/; Ancient Greek: Ἀρέθουσα means 'war-swift' from arês and thoos) may refer to the following personages: * Arethusa, one of the 50 Nereids, sea-nymph daughters of the 'Old Man of the Sea' Nereus and the Oceanid Doris. She was counted in the train of Cyrene along with her sister Opis, Deiopea and Ephyra. * Arethusa, a nymph of a spring who was pursued by the river god Alpheus. She was a huntress and attendant of Artemis. She may be the same with the above Arethusa. * Arethusa, one of the Hesperides, daughters of Nyx and Erebus, or Atlas and Hesperis, or Phorcys and Ceto and lastly of Zeus and Themis. * Arethusa, the Boeotian daughter of Hyperes, son of Poseidon and the Pleiad Alcyone. She was the mother of Abas, king of the Abantians in Euboea b