Lena Willemark (born 1960 ) is a Swedish traditional music fiddler, singer, and composer, who combines elements of folk and jazz.

Born in Älvdalen, Dalarna, Willemark grew up with the region's folk music. In Stockholm in the 1970s, she also had contact to jazz. She has collaborated with groups such as Frifot, Enteli, Elise Einarsdotter, and composer Karin Rehnqvist. She recording Nordan with Ale Möller, winning in 1994 both a Grammis and the Preis der Deutschen Schallplattenkritik. On a commission of Stockholm, Cultural Capital of Europe in 1998, she composed and performed Windogur.