The Praxis school was a Marxist humanist philosophical movement. It originated in Zagreb and Belgrade in the SFR Yugoslavia, during the 1960s.
Prominent figures among the school's founders include Gajo Petrović and Milan Kangrga of Zagreb and Mihailo Marković of Belgrade. From 1964 to 1974 they published the Marxist journal Praxis, which was renowned as one of the leading international journals in Marxist theory. The group also organized the widely popular Korčula Summer School in the island of Korčula.
Its members were influenced by the Western Marxist movement.
Due to the tumultuous sociopolitical conditions in the 1960s, the affirmation of 'authentic' Marxist theory and praxis, and its humanist and dialectical aspects in particular, was an urgent task for philosophers working across the SFRY. There was a need to respond to the kind of modified Marxism–Leninism enforced by the League of Communists of Yugoslavia (see Titoism). To vocalize and therefore begin to satisfy this need, the program of Praxis school was defined in French in the first issue of the International edition of Praxis: A quoi bon Praxis. Predrag Vranicki (On the problem of Practice) and Danko Grlić (Practice and Dogma) expanded this program in English in the same issue (Praxis, 1965, 1, p. 41-48 and p. 49-58).
The Praxis philosophers considered Leninism and Stalinism to be apologetic due to their ad hoc nature. Leninist and Stalinist theories were considered to be unfaithful to the Marxist theory, as they were adjusted according to the needs of the party elite and intolerant of ideological criticism.
The defining features of the school were: 1) emphasis on the writings of the young Marx; and 2) call for freedom of speech in both East and West based upon Marx's insistence on ruthless social critique. As Erich Fromm has argued in his preface to Marković's work From Affluence to Praxis, the theory of the Praxis theoreticians was to "return to the real Marx as against the Marx equally distorted by right wing social democrats and Stalinists".