Agesilaus (Ancient Greek: Ἀγησίλαος) may refer to:

• Agesilaus I (r. c.815–c.785 BC), Agiad king of Sparta
• Agesilaus II (r. 400–360 BC), Eurypontid king of Sparta, brother of Agis II
• Agesilaus (general), brother to Agis III, Eurypontid king of Sparta (r. 338–331 BC)
• Agesilaus (statesman), ephor in 242 BC, also uncle of Agis IV, king of Sparta (r. 244–241 BC)
• Agesilaus (historian), an ancient Greek historian
• Agesander (Hades), an epithet of the Greek god Hades, sometimes rendered as "Agesilaus"
• Agesilaus (Xenophon), biographical work about Agesilaus II written by Greek historian Xenophon