Miki Matsubara (松原 みき, Matsubara Miki; 28 November 1959 – 7 October 2004) was a Japanese singer and songwriter. She contributed to the opening and ending theme songs of the anime Gu-Gu Ganmo under the name Suzie Matsubara. Her 1979 debut song "Mayonaka no Door" became a hit, reaching No. 28 on the Oricon chart.

Believing that her cancer diagnosis was the result of the lifestyle she lived during her career, Matsubara retired and severed all connections to the music world in 2000, dying from cervical cancer four years later at the age of 44. Since 2020, "Mayonaka no Door" has become widely known overseas due to its use on TikTok and the resurgence of the city pop genre.

Miki Matsubara was born 28 November 1959 in Kishiwada, Osaka. She spent her childhood in Hiraoka Town, an area of Nishi-ku in Sakai, Osaka. She grew up with her mother, father, and younger sister. Her mother was a jazz singer who sang with the jazz band and comedy group Crazy Cats, while her father was a board member of a hospital. Matsubara started learning the piano at the age of three and later became familiar with jazz. As a child, she went to Sakai's Hiraoka Elementary School. In 1972, she entered Poole Gakuin Junior High School. Around this time, she became interested in rock music and joined the rock band Kurei.

In 1975, Matsubara started at Poole Gakuin High School and became active as a keyboard player of the band Yoshinoya Band. They would play songs at a live house called Takutaku in Kyoto. Matsubara was described as an excellent student and was expected by many around her to attend college, but had already made plans to become a singer. In 1977, when she was still in high school, she went to Tokyo alone at the age of 17 to make her debut as a singer. The Japanese pianist Yuzuru Sera [ja] found her playing music and singing in various places across the Kantō region, such as in the live music venue Birdland in Roppongi.

Matsubara started her career in 1979 and is known from hit songs such as her debut and immediate breakthrough "Mayonaka no Door (Stay with Me)" which has been covered by numerous artists, including Akina Nakamori. The song was ranked 28th on the Oricon Chart, and according to that chart sold 104,000 copies and 300,000 copies announced by Canyon records. Some of her other known songs were "Neat na gogo san-ji (ニートな午後3時)" and "The Winner" among others.

Matsubara became a well-known singer after her song Neat na Gogo San-ji was released, performing at college festivals, concerts and so on. The song gained a feature in a commercial of the Japanese multinational personal care company Shiseido.

Miki Matsubara received a number of artist awards. She formed her own band, Dr. Woo. Matsubara also had some international work with Motown jazz fusion group Dr. Strut in Los Angeles (becoming a backing band in the album recordings for "Cupid" and "Myself"), Tokyo and Osaka (Hall concerts), later releasing a jazz cover album titled Blue Eyes. On that album she covered some famous jazz songs like "Love for Sale" and the soft rock song "You've Got a Friend", originally written and sung by Carole King.

Her vocal range was that of a mezzo-soprano.