Masanori Tominaga (冨永 昌敬, Tominaga Masanori, born October 31, 1975) is a Japanese film director. His 1999 short film, Dolmen, received the Honorary Mention of the International Jury at the International Short Film Festival Oberhausen in 2000.

Tominaga directed the first feature film, The Pavillion Salamandre, starring Joe Odagiri. He directed Pandora's Box, starring Shota Sometani and Riisa Naka, based on the novel by Osamu Dazai. He directed the comedy film, Vengeance Can Wait, starring Minami, Tadanobu Asano, Eiko Koike and Takayuki Yamada.