| Harold Ave | |
| Birth Date: | 29 March 1900 |
| Birth Place: | Cleveland, Ohio, U.S. |
| Death Place: | Macomb, Illinois, U.S. |
| Player Sport1: | Football |
| Player Years2: | 1921 |
| Player Team2: | Carnegie Tech |
| Player Years3: | c. 1922 |
| Player Team3: | Baldwin–Wallace |
| Player Positions: | Guard |
| Coach Sport1: | Football |
| Coach Years2: | c. 1935 |
| Coach Team2: | Willoughby HS (OH) |
| Coach Years3: | 1938 |
| Coach Team3: | Eastern Illinois |
| Coach Years4: | 1939–1942 |
| Coach Team4: | Eureka |
| Coach Years5: | 1948 |
| Coach Team5: | Western Illinois |
| Coach Sport6: | Basketball |
| Coach Years7: | 1939–1942 |
| Coach Team7: | Eureka |
| Admin Years1: | c. 1935 |
| Admin Team1: | Willoughby HS (OH) |
| Admin Years2: | 1939–1942 |
| Admin Team2: | Eureka |
| Overall Record: | 15–28–2 (football) 35–25 (basketball) |
Harold Charles Ave (March 29, 1900 – August 9, 1986) was an American football and basketball coach. He served as the head football coach at Eureka College in 1938, at Eastern Illinois State Teachers College—now known as Eastern Illinois University—from 1939 to 1942, and at Western Illinois University in 1948, compiling a career college football record of 15–28–2. Ave was also the head basketball coach at Eureka from 1939 to 1942, tallying a mark of 35–25.
Ave played college football at Baldwin-Wallace College—now known as Baldwin Wallace University—and the Carnegie Institute of Technology—now known as Carnegie Mellon University. He was the athletic director and head coach at Willoughby High School in Willoughby, Ohio before he was hired at Eastern Illinois.[1]