Percy MacKaye (1875—1956) was an American dramatist and poet.
He was born in New York City, New York. He studied at Harvard (1897), before returning to New York City (1900-4) to teach. He subsequently settled in Cornish, New Hampshire.
He wrote the plays The Canterbury Pilgrims in 1903, Sappho and Phaon in 1907, Jeanne D'Arc in 1907, The Scarecrow in 1908, Anti-Matrimony in 1910, and the poetry collection The Far Familiar in 1937. In 1950, MacKaye published The Mystery of Hamlet King of Denmark, or What We Will, a series of four plays written as prequels to William Shakespeare's Hamlet.
In the 1920s, MacKaye was poet in residence at Miami University in Oxford, Ohio.He was the son of actor Steele MacKaye and brother of philosopher James MacKaye and of conservationist Benton MacKaye.
Percy MacKaye is considered to be the first poet of the Atomic Era because of his sonnet "The Atomic Law," which was published in the Christmas 1945 issue of The Churchman.
In 1912 he published The Civic Theatre in Relation to the Redemption of Leisure; A Book of Suggestions. Here he presented a concept of Civic Theatre as "the conscious awakening of the people to self-government in its leisure". To this end he called for the active involvement of the public, not merely as spectators, professional staff not dominated by commercial considerations and the elimination of private profit by endowment and public support. This concept was influential on Platon Kerzhentsev and the Soviet Proletcult Theatre movement.