Viet Rock is a rock musical by Megan Terry that was the precursor to the musical Hair. A violent denunciation of the American involvement in the Vietnam War, the play was described by its author as a "folk war movie" comprising scenes of disillusionment and protest to the American military presence in Southeast Asia. Viet Rock is widely considered to be the first rock musical written and performed in the United States, as well as the first protest play about Vietnam.