Paul Mattick Sr. (March 13, 1904 – February 7, 1981) was a Marxist political writer and social revolutionary, whose thought can be placed within the council communist[1] and left communist traditions.

Throughout his life, Mattick continually criticized Bolshevism,[2] Vladimir Lenin[3] and Leninist organizational methods,[4][5] describing their political legacy as "serving as a mere ideology to justify the rise of modified capitalist (state-capitalist) systems, which were [...] controlled by way of an authoritarian state".[6][7]