Within the current resurgence of interest in E.V. Ilyenkov, the influence of Engels on Ilyenkov’s work is either overlooked or denied, making Ilyenkov seem closer to Western Marxism than he actually is. In this paper, by considering Engels’s place in his philosophy, I show that Ilyenkov’s approach is fundamentally hostile to many of Western Marxism’s main views. Ilyenkov, like Engels, conceives philosophy as Logic and affirms the ‘alliance’ between philosophy and the natural sciences against speculative metaphysics. In this regard, he (...) develops an original cosmological hypothesis based on Engels’s insights on the hierarchy of matter’s forms of movement and provides a remarkable account of the ideal as an attribute of nature that reproduces its concrete universality through social labour, the active transformation of nature’s phenomena into objects stamped with the seal of our subjectivity. (shrink)