Taisei Ota (翁田 大勢, Ota Taisei, born June 29, 1999) is a professional Japanese baseball player.

He is a pitcher for the Yomiuri Giants of Nippon Professional Baseball (NPB).

On September 10, 2023, while pitching for Yomiuri's farm team, Taisei combined with Haruto Inoue to no-hit the Tokyo Yakult Swallows farm team.

[2] Taisei represented Japan at the 2023 World Baseball Classic.

This biographical article relating to a Japanese baseball pitcher is a stub.