In Greek mythology, Themisto (/θəˈmɪstoʊ/; Ancient Greek: Θεμιστώ, romanized: Themistṓ, lit. 'belonging to the law or customs') may refer to the following women: * Themisto, one of the 50 Nereids, marine-nymph daughter of the sea divinities Nereus and the Oceanid Doris. * Themisto, daughter of the river god Inachus, who became the mother of by Zeus. * Themisto, daughter of the Hyperborean king , mother of by Apollo. * Themisto, the third and last wife of Athamas.