Demonax was a Cynic philosopher who lived during the 2nd century CE in the Roman Empire. He was born on the island of Cyprus and later moved to Athens, where he studied under several notable teachers. He spent his long life, reportedly nearly one hundred years, practicing philosophy in Athens.

He followed the Cynic school but was known for a milder approach. Unlike some earlier Cynics known for extreme behavior, Demonax was celebrated for his wit, gentle humor, and ethical integrity. He lived simply, without marrying or owning property, but avoided deliberate public shock tactics. According to the ancient sources, he became deeply respected by the people of Athens.

No writings by Demonax himself survive. Our knowledge of him comes entirely from a short biography written by the satirist Lucian of Samosata. This work records many anecdotes and sayings that portray Demonax using clever remarks to critique societal norms and offer philosophical guidance.

Modern scholars see Demonax as a significant example of a later, more adaptable Cynic philosopher. His portrayal suggests how Cynic ideals could be expressed through a virtuous daily life and witty criticism, rather than through harsh asceticism alone. His legacy, preserved through Lucian’s literary portrait, offers insight into the public role of philosophers in the Roman Imperial period.