Diagoras may refer to:

• Diagoras of Melos – an Atheist philosopher and poet (5th century BC)
• Diagoras of Rhodes – a boxer (5th century BC)
• Diagoras – a Greek physician quoted in Natural History of Pliny
• Diagoras F.C. – football club named after Diagoras of Rhodes
• Rhodes International Airport, "Diagoras"
• Mr Diagoras, a character from the British science fiction series Doctor Who who became the human part of Dalek Sec, a Dalek-human hybrid
• Doctor Diagoras, one of the mad scientists of Stanisław Lem
• Diagoras ephialtes - a species of stick insect in the subfamily Platycraninae

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