Mari Amachi (天地 真理, Amachi Mari, born November 5, 1951) is a Japanese female singer and actress, who was famous in 1970s' Japan. On October 1, 1971, she debuted with the single "Mizuiro no Koi." She was born as Mari Saito in Omiya, Saitama Prefecture. She got five Oricon No.1 songs, a record as a female singer which was later broken by Seiko Matsuda. She started the era of Japanese idols in the 1970s and 1980s. Mari Amachi was the top female vocalist of Sony Music Entertainment in Japan.