Agamemnon is a 1738 tragedy by the British writer James Thomson. It is based on the story of Agamemnon from Greek Mythology. The original Drury Lane cast included James Quin as Agamemnon, William Milward as Egistus, Theophilus Cibber as Melisander, William Havard as Talthybius, Mary Porter as Clytemnestra, Sussanah Arne as Cassandra, as Electra and Thomas Wright as Arcas. The prologue was written by Thomson's friend David Mallet, with Thomson returning the favour by adding a prologue to Mallet's Mustapha the following year.