Clara Gertrud Wichmann (17 August 1885 – 15 February 1922) was a German–Dutch lawyer and anarchist feminist activist, who became a leading advocate of criminal justice reform and prison abolition in the Netherlands.

[3][4] In 1914, she was employed by the Dutch Statistics Office as a lawyer, but was soon promoted to deputy director of the Social Welfare Institute.

[4] She became an activist in the prison abolition movement and campaigned against punitive justice, which she described as "a blot of backwardness, coarseness, shallowness and harshness.

"[4] In 1919, she established the Comité van Actie tegen de bestaande opvattingen omtrent Misdaad en Straf (English: Committee of Action against the existing views on Crime and Punishment) and co-founded the Bond van Revolutionair Socialistische Intellectuelen (English: Union of Revolutionary Socialist Intellectuals).

Hetty Clara survived the war and helped hide a Jewish family in Leiden whilst working with the resistance.