Megan Terry (born July 22, 1932) is an American playwright, screenwriter, and theatre artist. She has produced over fifty works for theater, radio, and television, and is best known for her avant-garde theatrical work from the 1960s. As a founding member of The Open Theater, she developed an actor-training and character-creation technique known as "transformation". She used this technique to create her 1966 work Viet Rock, which was both the first rock musical and the first play to address the war in Vietnam.