Masahiro Koga
古賀 正紘

Personal information
Full name	Masahiro Koga
Date of birth	(1978-09-08) September 8, 1978 (age 46)
Place of birth	Okawa, Fukuoka, Japan
Height	1.85 m (6 ft 1 in)
Position(s)	Defender
Youth career
1994–1996	Higashi Fukuoka High School
Senior career*
Years	Team	Apps	(Gls)
1997–2006	Nagoya Grampus Eight	231	(15)
2007–2010	Kashiwa Reysol	78	(5)
2010–2011	Júbilo Iwata	19	(0)
2012–2015	Avispa Fukuoka	74	(1)
Total		402	(21)
International career
1995	Japan U-17	3	(0)
Medal record Nagoya Grampus Eight Winner Emperor's Cup 1999 Kashiwa Reysol Runner-up Emperor's Cup 2008 Júbilo Iwata Winner J.League Cup 2010 Representing  Japan AFC U-16 Championship 1994 Qatar
*Club domestic league appearances and goals

Masahiro Koga (古賀 正紘, Koga Masahiro, born September 8, 1978) is a former Japanese football player. His younger brother Seiji is also a footballer.

Koga was born in Okawa on September 8, 1978. After graduating from high school, he joined the Nagoya Grampus Eight in 1997. He became a regular player as a center back from 1998. The club won the 1999 Emperor's Cup. He moved to Kashiwa Reysol in 2007. Although he played as a regular player, he lost his place due to an injury in 2010. He then moved to Júbilo Iwata in August 2010. After playing for two seasons, he moved to his local club Avispa Fukuoka in 2012. He retired at the end of the 2015 season.

In August 1995, Koga was selected by the Japan U-17 national team for the 1995 U-17 World Championship and he played full time in all three matches. In June 1997, he was also selected by the Japan U-20 national team for the 1997 World Youth Championship, but he did not play in any matches.

• Masahiro Koga – FIFA competition record (archived)
• Masahiro Koga at J.League (archive) (in Japanese)