Jaga Juno was born in 1900 in Poland, Russian Empire [now Poland]. She was an actress, known for Tajemnica przystanku tramwajowego (1922). She died on 22 March 1944 in Warsaw, Mazowieckie, Poland.
During the German occupation of Poland, Juno was a Gestapo informant; in a raid by the Home Army in 1943, her husband Kazimierz Junosza-Stepowski was killed while trying to protect her.