In Ancient Greek warfare, Psiloi were extremely light infantry who acted as skirmishers and missile troops.

Psiloi, often used as a broad term to describe types of unarmored or lightly armored infantry, have often been more explicitly referred to by other names, such as Gymnetes or Euzonoi, Grosphomachoi and Akontistai, Sphendonetai, Toxotai or Lithoboloi. The Peltast are often categorized as an intermediary infantry type, later grouped either with the Psiloi or the heavy infantry, according to their main tactical role.
