Sissy Löwinger (22 June 1941 – 25 September 2011) was an Austrian actress, director and theatre manager. She was the daughter of Austrian actors Liesl and Paul Löwinger. She worked in public relations and dramaturgy for the family theatre "Löwinger Bühne" together with her brother, Paul. Later she also directed plays. After her father's death she became manager of the theatre, again with her brother Paul. She directed and edited television comedies and also wrote eight plays. She appeared in the role of Walpurga in the Franz Josef Gottlieb directed German production of Saison in Salzburg (1961).

She was married to the very popular Austrian television presenter Peter Rapp, and later to Peter Blechinger, with whom she lived in a house in Neulengbach in Austria. Löwinger had a daughter from her first marriage.

Löwinger died on 25 September 2011 in Altlengbach, Lower Austria as a consequence of pulmonary embolism. She was 70.