Artemidorus of Knidos (Greek: Ἀρτεμίδωρος), 1st century BC, was a native of Knidos in southwest Anatolia. He is now best known as a minor character in Shakespeare's play Julius Caesar where, aware of the plot against Caesar's life, he attempts to warn him with a written note. Although Caesar takes the note he does not look at it before entering the Senate and shortly thereafter is assassinated. The story originates with Plutarch.