Naohiro Kotaki (小瀧尚弘, Kotaki Naohiro, born 13 June 1992) is a Japanese international rugby union player who plays in the lock position.

[1] He currently plays for the Sunwolves in Super Rugby and the Toshiba Brave Lupus in Japan's domestic Top League.

[2][3] Kotaki has played all of his senior club rugby in Japan with the Toshiba Brave Lupus who he joined in 2015.

[2][3] Kotaki was selected as a member of the first ever Sunwolves squad ahead of the 2016 Super Rugby season.

[4] Kotaki made his senior international debut for Japan in a match against South Korea on April 30, 2016 and also featured as a starter in all 3 of his country's tests during the 2016 mid-year rugby union internationals series.