Elisabeth Adelheid Hildegard von Thadden (29 July 1890 – 8 September 1944) was a German progressive educator and a resistance fighter against the Nazi régime as a member of the Solf Circle.

Her half-brother Adolf von Thadden (1921–1996), rose to be the National Democratic Party's chairman after World War II in West Germany.

Thadden always felt a keen connection with her fellow human beings, and this showed up early on when, during World War I, she made it possible for many city children to spend time in the somewhat more idyllic setting of Trieglaff.

[6] After training there, she got a job at a children's camp in Heuberg in the Swabian Jura, later also gaining experience at the Kurt Hahn school.

[8] The initial enrolment was thirteen girls, whom Thadden hoped to train "strictly and fairly to (be) independently thinking, emancipated women."

By the time Thadden founded her school, Adolf Hitler had already been released from prison after the Beerhall Putsch, and the Nazis were gaining popularity.

Here, according to her sister Ehrengard, she learnt, among other things, that letters reaching Germany from German prisoners of war in the Soviet Union had to be destroyed because Hitler believed that they would weaken morale at the front.

At one such meeting on 10 September 1943, hosted by Elisabeth von Thadden, one of the guests was an assistant doctor named Paul Reckzeh, who, as it turned out, was a Gestapo informant.

Over the next few months many were arrested, including Elisabeth von Thadden early on 12 January 1944, after she had moved to a post in Meaux in occupied France.

On 1 July 1944, the Volksgerichtshof, presided over by Roland Freisler, sentenced Elisabeth von Thadden to death for conspiring to commit high treason and undermining the fighting forces (Wehrkraftzersetzung).

Her last words were: "Put an end, Lord, to all our sufferings" quoted from Befiehl du deine Wege, a Lutheran hymn by Paul Gerhardt.