Takumi Saitoh (斎 藤 工 Saitō Takumi, Tokyo, Japan, August 22, 1981) is a Japanese actor, singer, and model.

Saitoh was born on August 22, 1981, in the city of Tokyo, Japan. He made his acting debut in 1992, playing a small role in the Japanese drama Ippai no kakesoba. In the following years, he worked as a model for companies like Calvin Klein and Issey Miyake. In 2001, he starred in the movie Toki no kaori: Remember me (a remake of the Korean film Ditto), while in 2006, he participated as Yūshi Oshitari in the musical adaptation of the manga The Prince of Tennis, a role that made him gain popularity as an actor.