Malgorzata Zajaczkowska, aka Margaret Sophie Stein (born January 31, 1956 in Warsaw), is a Polish actress and writer. Beginning in 1979, she acted on stage in the Teatr Narodowy. In 1981, Zajaczkowska moved to the United States and, adopting the stage name Margaret Sophie Stein, continued her acting career in television and film. In 1999, Zajaczkowska returned to Poland and continued acting there in films and television. She has also lectured at the Warsaw Film School.