Louis Aston Marantz Simpson (March 27, 1923 – September 14, 2012) was an American poet born in Jamaica. He won the 1964 Pulitzer Prize for Poetry for his work At the End of the Open Road.
- Born: Louis Aston Marantz Simpson, March 27, 1923, Colony of Jamaica
- Died: September 14, 2012 (aged 89), Stony Brook, New York
- Education: Columbia University (BA, MA, PhD)
- Occupation: Poet
- Known for: 1964 Pulitzer Prize for Poetry for his work At the End of the Open Road