Kenji Sahara (佐原 健二, Sahara Kenji; born 14 May 1932) is a Japanese actor. He was born in Kawasaki City, Kanagawa as Masayoshi Kato (加藤 正好, Katō Masayoshi). Initially, Sahara used the professional name Tadashi Ishihara before changing it when he secured the lead role in Rodan (1956).

Sahara did a lot of work for the Toho Company, the studio that so far has produced 28 Godzilla movies. He appeared in more of the Godzilla series than any other actor.

Also, he is the actor who was often relied on in most of the films by Directors Ishiro Honda and Eiji Tsuburaya.

He has appeared in many supporting roles.

Sahara is famous as a mainstay of Toho special-effects movies and the Ultraman series.

Sahara was also the lead in the first of the Ultra series, Ultra Q. He also appeared in a number of subsequent Ultra series, including:

His latest Ultraman appearance was in the 2008 Ultraman movie, Superior Ultraman 8 Brothers. He also made a cameo in episodes 47 and 48 of Sonic X, being the voice of Dr. Atsumi.