| Hiroyuki Deguchi | |
| Nationality: | Japanese |
| Sport: | Biathlon |
| Birth Date: | 17 January 1953 |
| Birth Place: | Hokkaido, Japan |
Hiroyuki Deguchi (born 17 January 1953) is a Japanese biathlete. He competed at the 1976 Winter Olympics, the 1980 Winter Olympics and the 1984 Winter Olympics.[1]