Masako Mori (森 昌子, real name Masako Morita; born October 13, 1958) is a Japanese idol, enka singer, and actress.
In 1973, she was part of "a hit female trio", which also included musicians Momoe Yamaguchi and Junko Sakurada. The music trio became popular as part of the television program Producing the Stars (Star Tanjō!); they were known as "The Trio of Third-Year Junior High School Students" ("Hana no Chu 3 Trio").
She debuted in 1972, at age 13, with the song "Sensei" (Master), receiving numerous music awards for it. The song reached the #3 position on the Oricon charts. Other hits include "Dōkyūsei" (Classmates), Chugaku Sannensei (Junior High School Third Grade), Okaasan (Mother) and Ettou Tsubame (The Wintering Swallow). She retired when she married Shinichi Mori in 1986, but in 2006 returned to the stage with the single "Barairo no Mirai". The song reached the #14 position on the Oricon charts.
In addition to being a singer, she has acted in a number of Japanese movies and TV dramas. ONE OK ROCK vocalist Takahiro Moriuchi and MY FIRST STORY vocalist Hiroki Moriuchi are her and Shinichi Mori's sons.
Masako Mori has performed a total of 15 times at Kōhaku Uta Gassen.