Alagonia () was a town of ancient Laconia, ancient Greece, near the Messenian frontier, belonging to the Eleuthero-Lacones, containing temples of the Greek gods Dionysus and Artemis. This town was 30 stadia distant from Gerenia.
It took its name from Alagonia, a daughter of Zeus and Europa.
Its site is tentatively located near the modern Anatoliko.