Hillyer Speed Lamkin was an American novelist and playwright. He is best known for his first novel Tiger in the Garden (1950) and was called "the poor man's Truman Capote" by the composer Ned Rorem. He was a recipient of a 1950 O. Henry Award for his short story 'Comes a Day', later adapted into a Broadway play.
Lamkin graduated from Harvard University in 1948, which he had entered at the age of 16.