Josefin Runsteen is a Swedish musician, producer, composer and arranger who works in many different genres.

Besides her own music, Josefin Runsteen has worked with pop artists like Adrianne Lenker, Ane Brun, Damien Rice, Håkan Hellström, Frank Ocean, Jens Lekman, Loney Dear, Alabaster de Plume etc as arranger musician or producer. Josefin also plays regularly with larger jazz bands like Fire! Orchestra, Trondheim Jazz Orchestra and Mariam the Believer.