István Mészáros (UK: , US: , Hungarian: ['i?tva?n 'me?sa?ro?]; 19 December 1930 – 1 October 2017) was a Hungarian Marxist philosopher.
Described as "one of the foremost political philosophers of the late twentieth and early twenty-first centuries" by Monthly Review, Mészáros wrote mainly about the possibility of a transition from capitalism to socialism.
His magnum opus, Beyond Capital: Toward a Theory of Transition (1995), was concerned not only with this theme but aimed to construct an analysis of the current capitalist society and its "structural crisis".
He was also interested to critique the so-called "bourgeois ideology", including the idea of "there is no alternative", and to analyse the failures of "real socialism".