Chilonis () was a Spartan princess, daughter of Leotychidas, wife of Cleonymus and mother of Areus II. She is known from Plutarch's "Life of Pyrrhus". Her much older husband Cleonymus, a son of Cleomenes II, had not been allowed to succeed to his father's throne because of his violent and tyrannical behaviour, and had spent many years away from Sparta as a soldier of fortune. Chilonis was unfaithful to him with Acrotatus, son of the king Areus I. Areus was away with his army in Gortyn, Crete (272 BC) when Cleonymus attacked his homeland with the help of Pyrrhus of Epirus.