| Koji Yamamoto | |
| Position: | first baseman |
| Bats: | Left |
| Throws: | Left |
| Birth Date: | December 25, 1951 |
| Birth Place: | Sakai, Osaka, Japan |
| Death Place: | Kitakyushu, Fukuoka, Japan |
| Statyear: | 1988 season |
| Statleague: | NPB |
| Stat1label: | Batting average |
| Stat1value: | .277 |
| Stat2label: | Home runs |
| Stat2value: | 64 |
| Stat3label: | RBI |
| Stat3value: | 369 |
| Stat4label: | Hits |
| Stat4value: | 699 |
| Stat5label: | Stolen base |
| Stat5value: | 13 |
| Stat6label: | Sacrifice bunt |
| Stat6value: | 24 |
| Teams: | As player
As manager
As coach
|
was a Japanese Nippon Professional Baseball infielder.