Karel Kosík was a Czech Marxist philosopher. In his most famous philosophical work, Dialectics of the Concrete (1963), Kosík presents an original reinterpretation of the ideas of Karl Marx in light of Martin Heidegger's phenomenology. His later essays can be called a sharp critique of the modern society from a leftist but not strictly Marxist position.

Marxist humanism is an international body of thought and political action rooted in a humanist interpretation of the works of Karl Marx. It is an investigation into "what human nature consists of and what sort of society would be most conducive to human thriving" from a critical perspective rooted in Marxist philosophy. Marxist humanists argue that Marx himself was concerned with investigating similar questions.