Yoshisada Sakaguchi (坂口 芳貞, Sakaguchi Yoshisada, 2 October 1939 – 13 February 2020) was a Japanese actor and voice actor from Tokyo.

He was a professor at J. F. Oberlin University, and was affiliated with Bungakuza.

He was best known for dubbing over Morgan Freeman and Chief Inspector Japp (in the television series Agatha Christie's Poirot).