Katsuhiro Matsuo (松尾勝博, Matsuo Katsuhiro) (born 6 January 1964, in Miyazaki Prefecture) is a former Japanese rugby union player who played as fly-half and coach.
After graduating from Nobeoka High School and going to Doshisha University, at the time, he contributed to the victories in the All-Japan University Rugby Championship in 1983 and 1984 editions.
Three years later, Shinobu Aoki, who, like Matsuo, was part of the squad that won against Scotland in 1989, was his direct rival for the position as regular fly-half in the Japan national team after the Asia-Pacific qualifiers, but during the 1991 Rugby World Cup, Matsuo took Aoki's place as the regular fly-half for Japan.
He took part at all the three pool matches of the World Cup first round, and contributed to the victory in the final pool match against Zimbabwe.
He was once again part of the Japanese team at the 1995 Rugby World Cup, although he never played any matches in the tournament.