Kenneth Rexroth (December 22, 1905–June 6, 1982) was an American poet, translator and critical essayist. He is regarded as a central figure in the San Francisco Renaissance, and paved the groundwork for the movement. Although he did not consider himself to be a Beat poet, and disliked the association, he was one of the major influences on the Beat generation, and was once dubbed "Father of the Beats" by Time. He was among the first poets in the United States to explore traditional Japanese poetic forms such as haiku.

Rexroth had two daughters, Mary (who later changed her name to Mariana) and Katharine, by his third wife, Marthe Larsen.

Rexroth was born Kenneth Charles Marion Rexroth in South Bend, Indiana, the son of Charles Rexroth, a pharmaceuticals salesman, and Delia Reed. His childhood was troubled by his father's alcoholism and his mother's chronic illness. Rexroth was homeschooled by his mother, and by age four he was reading widely in the Classics.^{[citation needed]} His mother died in 1916 and his father in 1918, after which he went to live with his aunt in Chicago and enrolled in the Art Institute of Chicago.