Arcesilaus I of Cyrene (Greek: Ἀρκεσίλαος; died 583 BC), also spelled Arkesilaos I, was the second Greek king of Cyrenaica and the second king of the Battiad dynasty.
Arcesilaus was the son of Battus I, the first king of Cyrenaica and Cyrene.
Arcesilaus’ paternal grandparents were the Cretan Princess Phronima and the distinguished Therean nobleman called Polymnestus.
He succeeded to the throne after the death of his father in 600 BC.
Arcesilaus died in 583 BC and was buried near his father.