Ottilie "Tilly" Spiegel (10 December 1906 - 1988) was an Austrian political activist, first as a member of the Communist Party and then as part of the wartime resistance. After her actions had earned her a term of imprisonment during the Austrofascist period she fled the country, ending up as in Paris as a member of the French Resistance. Her parents were murdered by the Nazis but five siblings managed to emigrate to England or to the United States. In 1945 the merger combining Germany and Austria was reversed at the insistence of the occupying powers whose military victory had put an end to the Hitler regime. Tilly Spiegel returned to Vienna (where she had spent her student years) and was one of the first researchers to study the histories of victims of National Socialism. Books that she published were frequently consulted and quoted by subsequent researchers.