| Tatsuya Yamaashi | |
| Position: | Infielder |
| Team: | Orix Buffaloes |
| Number: | 36 |
| Bats: | Right |
| Throws: | Right |
| Birth Date: | 26 October 1993 |
| Birth Place: | Hirakata, Osaka, Japan |
| Debutleague: | NPB |
| Debutdate: | May 30 |
| Debutyear: | 2018 |
| Debutteam: | Orix Buffaloes |
| Statyear: | 2023 season |
| Statleague: | NPB |
| Stat1label: | Batting average |
| Stat1value: | .197 |
| Stat2label: | Hits |
| Stat2value: | 63 |
| Stat3label: | Home runs |
| Stat3value: | 4 |
| Stat4label: | RBIs |
| Stat4value: | 23 |
| Stat5label: | Stolen bases |
| Stat5value: | 8 |
| Teams: |
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| Awards: | |
is a professional Japanese baseball player. He plays infielder for the Orix Buffaloes.[1] [2]