Persaeus of Citium was a Stoic philosopher who lived during the late 4th and early 3rd centuries BCE. He was a direct student and close companion of Zeno of Citium, the founder of Stoicism, and was even entrusted with the education of Zeno's sons. His life moved from the philosophical school to the political sphere when he joined the court of King Antigonus II Gonatas of Macedon, where he served as an advisor. According to ancient accounts, he later died in Corinth, though the exact circumstances of his death are unclear. His career is often seen as an early model of the Stoic ideal of engaging in public life.

Although none of his writings survive complete, he was a prolific author. Known titles of his lost works cover a wide range of subjects, including On Kingship, A Reply to Plato's Laws, On the Gods, and On the Spartan Constitution. These works show his engagement with central topics in ethics, politics, and theology.

Persaeus is significant as a first-generation Stoic who helped shape and disseminate the school's early doctrines. Modern scholars view his political career and his written critiques of thinkers like Plato as important evidence for the practical and intellectually broad character of early Stoicism. His works, known only through fragments and references in later authors, were considered valuable sources for early Stoic thought on governance and divinity.