| Seiya Inoue | |
| Position: | Infielder |
| Bats: | Right |
| Throws: | Right |
| Birth Date: | 3 July 1989 |
| Birth Place: | Hiroshima, Hiroshima, Japan |
| Debutleague: | NPB |
| Debutdate: | March 28 |
| Debutyear: | 2014 |
| Debutteam: | Chiba Lotte Marines |
| Finalleague: | NPB |
| Finaldate: | September 25 |
| Finalyear: | 2023 |
| Finalteam: | Chiba Lotte Marines |
| Statleague: | NPB |
| Stat1label: | Batting average |
| Stat1value: | .250 |
| Stat2label: | Home runs |
| Stat2value: | 76 |
| Stat3label: | RBI |
| Stat3value: | 313 |
| Teams: | |
, nicknamed "Aja",[1] is a Japanese former professional baseball infielder. He played in Nippon Professional Baseball (NPB) from 2014 to 2024 for the Chiba Lotte Marines.
Inoue played parts of 10 seasons in Nippon Professional Baseball from 2014 to 2014 for the Chiba Lotte Marines. Playing in 601 total games, he batted .250/.340/.417 with 76 home runs and 313 RBI. On October 22, 2024, Inoue announced his retirement from professional baseball.[2]