Clifford Emory "Pop" Horton (December 31, 1892 – April 14, 1981) was an American football, basketball, and baseball coach. He was the ninth head football coach at Illinois State Normal University—now known as Illinois State University—in Normal, Illinois, serving for two seasons, from 1923 to 1934, and compiling a record of 4–8–4. Horton was born on December 31, 1892, in Shelton, Washington. He married Garnetta E. Scheid on June 15, 1921, in Madison, Wisconsin. Horton died on April 14, 1981.