Johanna Sofia Blåsippa Karlsson (born 25 March 1975 in Enskede, Sweden) is a classically-trained Swedish folk singer and songwriter.

She is known for her interpretations of poems and songs by authors as varied as Baudelaire, Mikael Wiehe, Inger Hagerup, Carl Michael Bellman, Peps Persson, Evert Taube, and Boris Vian.

After touring the country for two years she released her third album Visor från vinden (Songs from the loft) with its collection of classical songs sung in Swedish, but written by poets and musicians such as Baudelaire, Dan Andersson, Marianne Flodin, Mikael Wiehe, Alf Hambe, Inger Hagerup, Carl Michael Bellman, Peps Persson, and Evert Taube.

Peggy Latkovich, writing on Rootsworld, describes Karlsson as "an artist who deals in nuance and delicate shadings", adding that her voice "has the smoky overlay of Sandy Denny and the expressive phrasing of Niamh Parsons".

[2] Göran Holmquist wrote in Helsingborgs Dagblad that "With its fingertip-light arrangement, she manages to bring Dan Andersson's poetry about dreams, breakup and longing into the present.