Arcesilaus (316/5–241/0 BC) was a Greek philosopher.
Arcesilaus or Arkesilaos (; ) is a Greek name (Arcesilaus is the Latin spelling), which may also refer to:
People Four Kings of Cyrene Arcesilaus I of Cyrene (fl. 7th–6th centuries BC) Arcesilaus II of Cyrene (fl. 6th century BC) Arcesilaus III of Cyrene (fl. 6th century BC) Arcesilaus IV of Cyrene (fl. 5th century BC)
Others Arcesilaus (mythology), one of the Greek leaders in the Trojan War Arcesilaus (satrap) (fl. 4th century BC), one of Alexander the Great's generals Arcesilaus (sculptor) (fl. 1st century), Roman sculptor Arcesilaus (consul) (fl. 3rd century AD), Roman senator appointed consul in AD 267
Astronomy 20961 Arkesilaos, an asteroid
See also Archelaus (disambiguation), a name commonly transliterated as "Arcesilaus"