Kostja Zetkin

Kostja Zetkin
Zetkin in 1909
Born
Konstantin Zetkin

14 April 1885
Paris, France
DiedSeptember 1980 (aged 95)
Occupation(s)Physician, political activist
SpouseGertrude Bardenhewer (1893–1980)
ChildrenLucas Bennett (step-son)
Parent(s)Ossip Zetkin (1850–1889)
Clara Eißner (1857–1933)
RelativesMaxim Zetkin (brother)

Konstantin "Kostja" Zetkin (14 April 1885 – September 1980) was a German physician, social economist and political activist.

He was the son of Clara Zetkin, an iconic pioneer of the political left in Germany. For a time, he became the lover of another, Rosa Luxemburg.