Masa Yamaguchi (born 1974) is a professional actor who appeared in the movie The Condemned.

Yamaguchi was born in London. He studied acting at Australia's National Institute of Dramatic Art, graduating in 2001. He later appeared in the film The Condemned as Saiga, a Japanese killer, who later teams up with McStarley. He has studied martial arts. He has also acted on stage, including in Katherine Thomson's King Tide for the Griffin Theatre Company.