Na Yoon-sun (Korean: 나윤선; born August 28, 1969), also known as Youn Sun Nah, is a South Korean jazz musician.^[1]

Na Yoon-sun was born on August 28, 1969, in Seoul. Her parents are musical: her father, Na Young-soo (나영수), is a conductor in Korea and her mother, Kim Mi-jung (김미정), is a musical actress. She studied French literature at Konkuk University in Korea. While she was working for a fashion company, she was scouted by Kim Min-gi (김민기), who was the president of the Hakchon Theater Company (극단 학전). There, she made her acting debut in a musical called Subway Line 1 (지하철 1호선).

Having been exposed to many kinds of music by her parents, Na decided to study and sing jazz after her performance in Subway Line 1. In 1995, she went to Paris to study jazz and chanson. There, she studied jazz at the CIM Jazz School, the National Music Institute of Beauvais, and the Nadia and Lili Boulanger Conservatory. After graduating, she taught students at the CIM Jazz School from 2000 to 2001. She formed her own quintet, YSN 5tet, and performed at various jazz clubs, theaters, festivals, and bars in France. Also in 2001 she released her debut album, Reflet. Her mostly self-composed 2002 album, Light for the people, was her first album to receive a wide distribution. She recorded the follow-up, Down by love, with guitarist Olivier Ode. With her 2004 release So I am, she became more known in Europe.^{[citation needed]}

In 2007, she made a pop record, Memory Lane. In 2008, she signed a contract with German label ACT, and in 2009 was acknowledged for her musical contributions in France by receiving the distinction of the Chevaliers of the Ordre des Arts et des Lettres.^[2] She released her album Same Girl in 2010 and in 2013 this was followed by Lento. From 2009 to 2015, she gave about 500 performances in many countries, including prestigious festivals such as the Montreux Jazz Festival.^[3]

She was not influenced by any historical jazz musicians, because she did not have any knowledge of jazz music until her late start as a singer.^{[citation needed]} Even though she began studying jazz history in Paris, it was after she had already created her own vocal style. Rather, she sang various genres of music from classical music to rock music by herself before she studied jazz in Paris.