Katsuyuki Masuchi

is a Japanese judoka. His wife, Chiyori is bronze medalist of Olympic Games in 1992.

Masuchi is from Tsu, Mie. He began judo at the age of a 10 and after graduation from Tsukuba University, He belonged to Marunaka and Nippon Steel.

He became Asian champion of openweight category in 1994, 1997. He also participated All-Japan Judo Championships 13 times, and the record is the most in history.