Rie fu (born January 11, 1985) is a Japanese singer-songwriter born in Tokyo. She is a graduate of the University of the Arts, London.

From the age of 7 to 10, Rie fu lived in Maryland, United States. She was greatly influenced by The Carpenters and female singers/songwriters such as Sheryl Crow and Michelle Branch. Rie fu started writing songs in high school with her piano and guitar. Within a year, her talents were recognized by Sony, who released her first single in March 2004.

After returning to Japan, from 1995 to 2003, Rie finished her primary and secondary education in Tokyo. In 2002 she learned guitar, and almost immediately began coming up with songs and recording them with a small tape recorder. She sent the demo tape off to a record company (Sony) and they signed her. Her first single was released in March 2004. Later that year, her song "Life is Like a Boat" was chosen as the Bleach ending theme, garnering her widespread recognition and demand. In 2005, a year after her debut, another song, I Wanna Go To A Place... was used as the Gundam Seed Destiny third ending song, and in 2006 her song Until I Say was used as the theme to the Japanese release of the 2005 British movie Heidi. In 2007, she performed the ending theme, Tsukiakari, to the anime series Darker than Black.

Rie fu's songs are often bilingual. Although most of her songs are primarily sung in Japanese, many feature entire verses written in English. Her debut album features two entirely English songs, "Voice" and "Shine," both of which she wrote herself. Of her songs written entirely in Japanese, at least two have later been released with English language versions.

Rie completed a Bachelor of Fine Arts from Central Saint Martins College of Art & Design, London, in 2007. She has returned to Japan to further pursue her musical career.