| Harry Trotter | |
| Birth Date: | 18 October 1890 |
| Birth Place: | Kansas, U.S. |
| Death Place: | Beverly Hills, California, U.S. |
| Player Sport1: | Track and field |
| Player Years2: | c. 1910 |
| Player Team2: | USC |
| Player Positions: | Shot putter |
| Coach Sport1: | Football |
| Coach Years2: | 1916–1917 |
| Coach Team2: | Manual Arts HS (CA) |
| Coach Years3: | 1918–1919 |
| Coach Team3: | Pasadena HS (CA) |
| Coach Years4: | 1920–1922 |
| Coach Team4: | Southern Branch |
| Coach Years5: | 1943–1944 |
| Coach Team5: | Willamette |
| Coach Sport6: | Basketball |
| Coach Years7: | 1943–? |
| Coach Team7: | Willamette |
| Coach Sport8: | Track and field |
| Coach Years9: | 1920–1946 |
| Coach Team9: | Southern Branch / UCLA |
| Overall Record: | 7–16–1 (college football) |
Harry Elbert "Cap" Trotter (October 18, 1890 – December 28, 1954)[1] was an American football, basketball, and track and field coach. He served as the head football the Southern Branch of the University of California—now known as the University of California, Los Angeles (UCLA)—from 1920 to 1922 and at Willamette University from 1943 to 1944, compiling a career college football record of 7–16–1. He was inducted into the Ventura County Sports Hall of Fame in 1989.[2]
UCLA began to play in the Southern California Intercollegiate Athletic Conference (SCIAC) in 1920, and competed against Occidental College, California Institute of Technology, University of Redlands, Whittier College, and Pomona College. Coach Trotter's two wins were against Redlands and San Diego State University, which did not join the SCIAC until 1926.