Kathy Acker (April 18, 1947 – November 30, 1997) was an American experimental novelist, playwright, essayist, and postmodernist writer known for her idiosyncratic and transgressive writing that dealt with themes such as childhood trauma, sexuality and rebellion. She was influenced by the Black Mountain School poets, William S. Burroughs, David Antin, Carolee Schneeman, Eleanor Antin, and by French critical theory, mysticism, and pornography, as well as classic literature.