Katsumasa Miyamoto (, born 28 August 1972) is a Japanese professional golfer. Miyamoto was born in Shizuoka Prefecture. After turning professional, he joined the Japan Golf Tour, where he has won 12 times. He won his first title in 1998, adding another later that year. He added two more wins in 2001 and 2014 and one win in 2003, 2007, 2008, 2010, 2017 and 2019.

Professional wins (18)

Japan Golf Tour wins (12)

Japan Golf Tour playoff record (2–3)

Other wins (1)

Japan PGA Senior Tour wins (5)

Results in major championships

Note: Miyamoto only played in The Open Championship. CUT = missed the half-way cut

Results in World Golf Championships

{{legend|#eeeeee|Did not play}} "T" = Tied

Team appearances

Amateur Professional