Karl Heinrich Marx (5 May 1818 – 14 March 1883) was a German philosopher, economist, sociologist, historian, journalist, and revolutionary socialist. His ideas played a significant role in the development of social science and the socialist political movement. He published various books during his lifetime, with the most notable being The Communist Manifesto (1848) and Capital (1867–1894); some of his works were co-written with his friend and fellow German revolutionary socialist, Friedrich Engels.

Karol Marks (niem. Karl Heinrich Marx; ur. 5 maja 1818 w Trewirze, w Prusach, zm. 14 marca 1883 w Londynie) - filozof, ekonomista i działacz rewolucyjny. Twórca marksizmu, współzałożyciel Pierwszej Międzynarodówki.