Junya Koga (古賀 淳也, Koga Junya, born July 19, 1987) is a Japanese backstroke swimmer.

He is a Waseda University student in Tokyo.

In May 2009, he set the Japanese records in the 50 m and 100 m backstrokes at the 2009 Japan Championships, qualifying for Japan's team to the 2009 World Championships.

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