Keiji Hirose (廣瀬 佳司, born April 16, 1973 in Osaka) is a former Japanese rugby union player. He played as a fly-half. His club team was Toyota Verblitz.
Hirose was awarded 40 caps for Japan, since a 26-11 over South Korea, at 29 October 1994, in a Rugby World Cup qualifier, in Kuala Lumpur, Malaysia. Hirose scored 5 tries, 77 conversions, 79 penalties and 2 drop goals, reaching a national record of 422 points in aggregate. He was the Japanese goalkicker during his international career.
He played at the 1995 Rugby World Cup, in a single game, the infamous 145-17 defeat to New Zealand, in 4 June 1995. Hirose scored 2 conversions and 1 penalty in the game.
In the 44-17 win over Tonga, at 8 May 1999, in Tokyo, during the Pacific Rim Championship, he kicked a then record of 9 penalties from 9 attempts.
He played once more at the 1999 Rugby World Cup, in all the three games, being the top scorer for Japan, with 5 penalties and 4 conversions, 23 points on aggregate. Hirose played once at the 2003 Rugby World Cup, in a 32-11 defeat to Scotland, at 12 October 2003, scoring 2 penalties. His last international game came at 5 November 2005, in a 44-29 win over Spain, in Tokyo, aged 32 years old. Hirose had a memorable farewell, scoring 5 conversions, 2 penalties and 1 drop goal, in an aggregate of 19 points.