| Hahn William Capps | |
| Birth Date: | 16 December 1903 |
| Death Date: | [1] |
| Nationality: | American |
| Fields: | Entomology |
| Workplaces: | United States Department of Agriculture Bureau of Entomology Plant Quarantine |
| Alma Mater: | University of Kansas |
Hahn William Capps (December 16, 1903 – September 14, 1998) was an American entomologist.
Capps was born in 1903. In 1929, he received his bachelor's degree from the University of Kansas. In 1930, he joined the United States Department of Agriculture, and the same year became plant quarantine inspector for the Bureau of Entomology and Plant Quarantine. In 1938, he became an assistant entomologist, and by 1940 he was made an entomologist. He kept the position until he retired in 1964. He studied larval and adult stages of Lepidoptera.[2]