Birgitta Margaretha Ulfsson was a Finnish actress and theater director. She was a versatile actor and a recognized pioneer of avant-garde theater in Finland. She started her career at Svenska Teatern, a theater in Helsinki for Swedish-language theater productions. She created roles both in Finnish and in Swedish language, and from the early 1980s, she worked regularly also in Sweden. In Sweden, she was best known as "Muminmamma" in the TV series about Mumintrollet and for her role in Rederiet.