Kotaro Yamasaki (山崎 晃大朗, Yamasaki Kotaro, born August 11, 1993) is a Japanese former professional baseball outfielder.

He played in Nippon Professional Baseball (NPB) for the Tokyo Yakult Swallows.

Yamasaki played in Nippon Professional Baseball for 9 seasons, slashing .246/.306/.310 with 7 home runs, 97 RBI, and 48 stolen bases.

On September 25, 2024, Yamasaki announced that he would be retiring following the conclusion of the season.

[1] This biographical article relating to a Japanese baseball outfielder is a stub.