Atsushi Koga
| Date of birth | February 25, 1975 | ||||||||||||||||||||||||||||
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| Place of birth | Kanagawa Prefecture, Japan | ||||||||||||||||||||||||||||
| Height | 174 cm (5 ft 9 in) | ||||||||||||||||||||||||||||
| Weight | 88 kg (194 lb) | ||||||||||||||||||||||||||||
| School | Fujisawa Nichidai High School | ||||||||||||||||||||||||||||
| University | Yamanashi Gakuin University | ||||||||||||||||||||||||||||
| Rugby union career | |||||||||||||||||||||||||||||
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Atsushi Koga (古賀淳, Koga Atsushi), sometimes translated erroneously as Jun Koga, (born Kanagawa Prefecture, 25 February 1975) is a Japanese former rugby union player who played as Centre.