Busk Margit Jonsson (born 10 September 1929) is a Swedish Soprano opera singer.
Jonsson was born in Malung, Dalarna County. She played many roles during her time at the Royal Swedish Opera from 1954 to 1983, and was awarded the prestigious "Jussi Björling scholarship" in 1975.
Jonsson has been guest host on the popular radio programme Sommar.
From 1964-1977 she was married to Swedish actor Helge Skoog. She had been married to opera singer Ingvar Wixell before then.