Kotaro Taniguchi (谷口耕太郎, Taniguchi Kōtarō, born 3 November 1994) is a Japanese sprinter competing primarily in the 200 metres.

He finished fourth at the 2015 Asian Championships.

As part of the Japanese 4 × 100 metres relay, he won medals at the 2015 IAAF World Relays and 2015 Summer Universiade.

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