Lloyd Frederick "Pop" Klein (c. 1900 – October 14, 1968) was a coach of football and basketball at the high school and collegiate levels. He began his career as a football and basketball at Crete High School where he accumulated an 89–19 record in football and 200–54 in basketball. He won a state basketball championship at Crete in 1928. Klein died at the age of 68, on October 14, 1968, at his home in Prescott, Arizona.