Hiroyuki Nishiuchi

{{short description|Japanese triathlete}}

{{nihongo|Hiroyuki Nishiuchi|西内 洋行|Nishiuchi Hiroyuki}} (born October 13, 1975) is an athlete from Japan. He competes in the triathlon.

Nishiuchi competed at the first Olympic triathlon at the 2000 Summer Olympics. He took forty-sixth place with a total time of 1:56:59.76.

Four years later, at the 2004 Summer Olympics, Nishiuchi competed again. He placed thirty-second with a time of 1:57:43.51.