Clara Zetkin (; German: [‘tsetki:n]; nee Eissner [‘aIsna]; 5 July 1857 – 20 June 1933) was a German Marxist theorist, communist activist, and advocate for women’s rights.
Until 1917, she was active in the Social Democratic Party of Germany. She then joined the Independent Social Democratic Party of Germany (USPD) and its far-left wing, the Spartacist League, which later became the Communist Party of Germany (KPD). She represented that party in the Reichstag during the Weimar Republic from 1920 to 1933.