| Hiroyuki Kobayashi | |
| Team: | Musashi Heat Bears |
| Number: | 41 |
| Position: | Pitcher/Manager |
| Birth Date: | 1978 6, mf=yes |
| Birth Place: | Sōka, Saitama, Japan |
| Bats: | Right |
| Throws: | Right |
| Debutleague: | NPB |
| Debutdate: | July 4 |
| Debutyear: | 1998 |
| Debutteam: | Chiba Lotte Marines |
| Statyear: | 2014 |
| Statleague: | NPB |
| Stat1label: | Win–loss |
| Stat1value: | 75-74 |
| Stat2label: | Saves |
| Stat2value: | 29 |
| Stat3label: | Earned run average |
| Stat3value: | 3.57 |
| Stat4label: | Strikeouts |
| Stat4value: | 1135 |
| Teams: | As player
As manager
|
is a Japanese professional baseball right-handed pitcher. He played in the 2006 World Baseball Classic for Japan.
As a relief pitcher Kobayashi throws a fastball that sits in 87-91 mph (tops out at 93 mph), silder, change-up, and an effective forkball as his out pitch.