This articule attemps to clarify the unique social structure, which defines utopia in Levinas's thought, emphasizing its structural antagonism to the social form of the totalitarian structure. We argue that Levinasian utopia, as social form, is founded on the matrix of the "intersubjective separation". Hence, under this relation, the Levianasian utopia appears as a dimension that is radically opposed to the social structure of totalitarianism, where the "intersubjective separation" is impossible. The social being of utopia in Levinas is separation, whereas in totalitarianism the social being is agglutination. While the utopia separates the totalitarianism fuses together. Our approach will be supported with analytical elements drawn from Miguel Abensour's work about utopia. Thus, we assume Miguel Abensour's critical-political perspective of analysis as our own; consequently the critique of totalitarianism is determinant for the clearing of the utopian dimension.