Takeshi Koga (?? ?, Koga Takeshi, born 11 May 1939) is a retired Japanese judoka.
Koga is from Kokura, Fukuoka and began judo at the junior high school days.
In 1961, When he was a student of Nihon University, was chosen to represent Japan in the World Championship held in Paris and got a bronze medal.
Koga began working for the Yawata Steel after graduation from university in 1962.
Koga also participated All-Japan Championships 8 times and won a bronze medal in 1965.