The Battle of Spartolos took place in 429 BC between Athens and the Chalcidian League and their allies, in the early part of the Peloponnesian War.

To ensure a steady stream of imperial revenue and suppress additional local uprisings, the Athenians dispatched Xenophon (son of Euripides) with 2,000 hoplites and 200 cavalry to launch an attack on Spartolos.

In the Athenian tribute list of 429/8 BC the only cities of Chalcidice are: Mende, Aphytis, Scione, Stageira and Acanthus (Athos).

This left the Chalcidian army worn and strained, and the battle looked very promising for the Athenians.

The back ranks of Athenian troops began to abandon those at the front, allowing them to be overwhelmed, surrounded, and killed, including their general, Xenophon.