Harold Cagle, who attended Maud and Shawnee schools, became a nationally-known track star at OBU and the school's only Olympic medalist during his years on Bison Hill.

In his first OBU season, 1935, he was a member of the mile-relay team which won at the Kansas Relays and was second at Drake. In 1936 he was on relay teams which won the mile at Drake, the mile and sprint medley at Texas, and the 880 at Kansas—and finished second in the sprint medley relay at Drake. Also in 1936, Cagle ran the 440-yard dash in 46.5 (two seconds off the world record at that time) at a national intercollegiate meet in Chicago.

He qualified for the U.S. 1600-meter relay team which finished second in the 1936 Berlin Olympics, earning him a silver medal. The U.S. team also toured Germany, Scandinavia, and the British Isles.

In 1937 he was a member of OBU's mile relay team which finished second  and sprint medley relay team which finished fourth at Drake.

In 1938 he ran on the OBU relay team which won the 880 and mile at the Texas Relays and the mile at Drake. Also in 1938, Cagle won the 440-dash at the Drake Relays in a meet-record 47.7 and at the Oklahoma AAU Meet in 47.2. He placed second in the 440 at the Compton Invitational in 47.5 and second in the 400 meters at the Princeton Invitational in 47.5.

In 1939 he won the 440 at the Sugar Bowl Classic in 49.1; the 600 at the Boston Knights of Columbus Indoor Athletic Meet in a record time of 1:12.6; and the 400-meters at the Oklahoma AAU Meet in 47.9.

After graduation, Cagle served in the Army during World War II. He then coached and taught at Marysville, California, until retirement.

A member of the Helms Foundation Hall of Fame, Cagle died in 1977.