Hiroyuki Kobayashi (小林 宏之, 小林宏, Kobayashi Hiroyuki, Kobayashi-Hiro, born June 4, 1978) 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.

External links
- Nippon Professional Baseball career statistics from JapaneseBaseball.com
- Hiroyuki Kobayashi, JapaneseBallPlayers.com Archived September 1, 2013, at the Wayback Machine