| Ryoichi Adachi | |
| Position: | Infielder / Coach |
| Team: | Orix Buffaloes |
| Number: | 83 |
| Birth Date: | 7 January 1988 |
| Birth Place: | Takasaki, Gunma, Japan |
| Bats: | Right |
| Throws: | Right |
| Debutleague: | NPB |
| Debutdate: | May 12 |
| Debutyear: | 2012 |
| Debutteam: | Orix Buffaloes |
| Statyear: | 2023 season |
| Statleague: | NPB |
| Stat1label: | Batting average |
| Stat1value: | .245 |
| Stat2label: | Home runs |
| Stat2value: | 36 |
| Stat3label: | RBI |
| Stat3value: | 323 |
| Stat4label: | Stolen bases |
| Stat4value: | 127 |
| Teams: |
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| Awards: | |
is a Japanese professional baseball infielder for the Orix Buffaloes of Nippon Professional Baseball (NPB).
Adachi was selected to play in the .[1]
On September 13, 2024, Adachi announced that he would be retiring following the conclusion of the season.[2]