Phaedrus may refer to:

• Phaedrus (Athenian) (c. 444 BC – 393 BC), an Athenian aristocrat depicted in Plato's dialogues
• Phaedrus (fabulist) (c. 15 BC – c. AD 50), a Roman fabulist
• Phaedrus the Epicurean (138 BC – c. 70 BC), an Epicurean philosopher

• Phaedrus (dialogue), a dialogue of Plato
• Phaedrus (play), a 3rd-century BCE comedic play by Alexis (poet)
• Phaedrus, a character in Zen and the Art of Motorcycle Maintenance
• A work by Cy Twombly
• Phaedrus, Johnathan, a character in the Reckoners novels by Brandon Sanderson.

• Phaedra (disambiguation)