| Toshiya Adachi | |
| Position: | Infielder |
| Birth Date: | 12 June 1965 |
| Birth Place: | Kariya, Aichi Japan |
| Bats: | Switch |
| Throws: | Right |
| Debutdate: | July 9 |
| Debutyear: | 1985 |
| Debutteam: | Kintetsu Buffaloes |
| Finaldate: | April 26 |
| Finalyear: | 1996 |
| Finalteam: | Kintetsu Buffaloes |
| Stat1label: | Batting average |
| Stat1value: | .222 |
| Stat2label: | Home runs |
| Stat2value: | 4 |
| Stat3label: | Hits |
| Stat3value: | 943 |
| Stat4label: | Runs batted in |
| Stat4value: | 58 |
| Teams: | |
is a retired Japanese Nippon Professional Baseball player with the Kintetsu Buffaloes.