Kenneth Elton "Ken" Kesey (pronounced /ˈkiːziː/; September 17, 1935 – November 10, 2001) was an American author, best known for his novel One Flew Over the Cuckoo's Nest (1962), and as a counter-cultural figure who considered himself a link between the Beat Generation of the 1950s and the hippies of the 1960s. "I was too young to be a beatnik, and too old to be a hippie," Kesey said in a 1999 interview with Robert K. Elder.

Ken Kesey was born in La Junta, Colorado to dairy farmers Frederick A. Kesey and Ginevra Smith. In 1946, the family moved to Springfield, Oregon. A champion wrestler in both high school and college, he graduated from Springfield High School in 1953.

In 1956, while attending college at the University of Oregon in neighboring Eugene, Kesey eloped with his high-school sweetheart, Norma "Faye" Haxby, whom he had met in seventh grade. They had three children, Jed, Zane, and Shannon; Kesey had another child, Sunshine, in 1966 with fellow Merry Prankster Carolyn Adams.