| Ryotaro Doi | |
| Position: | Pitcher |
| Birth Date: | 11 January 1981 |
| Birth Place: | Kochi, Kochi, Japan |
| Bats: | Right |
| Throws: | Right |
| Debutleague: | NPB |
| Debutdate: | April 20 |
| Debutyear: | 2003 |
| Debutteam: | Yokohama BayStars |
| Statyear: | 2007 |
| Statleague: | NPB |
| Stat1label: | Win–loss record |
| Stat1value: | 1-5 |
| Stat2label: | ERA |
| Stat2value: | 4.22 |
| Stat3label: | Strikeouts |
| Stat3value: | 56 |
| Teams: |
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(born January 11, 1981) is a former professional baseball player in Japan.[1] Doi for a period played for the Yokohama BayStars. Doi played as a pitcher.[2]