|Born:||June 26, 1970|
|Years active:||1990 - present|
Masaharu Sekiguchi (関口正晴 Sekiguchi Masaharu?) is a Japanese actor. He is noted for his role as Katsuto Asahi, the human form of Ultraman Zearth in the same name film and Ultraman Zearth 2: Superhuman Big Battle - Light and Shadow. He was also the voice actor of Ultraman Zearth.