The helots (; Greek: εἵλωτες, heílotes) were a subjugated population that constituted a majority of the population of Laconia and Messenia – the territories ruled by Sparta. There has been controversy since antiquity as to their exact characteristics, such as whether they constituted an Ancient Greek tribe, a social class, or both. For example, Critias described helots as "slaves to the utmost", whereas according to Pollux, they occupied a status "between free men and slaves". Tied to the land, they primarily worked in agriculture as a majority and economically supported the Spartan citizens.

The number of helots in relation to Spartan citizens varied throughout the history of the Spartan state; according to Herodotus, there were seven helots for each Spartan at the time of the Battle of Plataea in 479 BC. Thus the need to keep the helot population in check and prevent rebellion was one of the main concerns of the Spartans. Helots were ritually mistreated and humiliated. Every autumn the Spartans would declare war on the helots so they could be mistreated by a member of the Crypteia without fear of religious repercussion. Uprisings and attempts to improve the lot of the helots did occur, such as the Conspiracy of Cinadon.