Iago is a fictional character and main antagonist in William Shakespeare's Othello. Viewed as one of Shakespeare's most evil villains, Iago uses deception to manipulate other characters in the play, with dire consequences for others and himself.

Nicholas J. Crowe, "Iago (Shakespeare's Othello)," Encyclopedia of Deception, ed. by Timothy R. Levine (Los Angeles: SAGE Reference, 2014), 2:491-93.