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This short communication aims to evaluate the cure kinetics of epoxy/Ni_xFe_3−xO₄ nanocomposites. Differential scanning calorimetry (DSC) provided support for cure kinetics analysis based on the variation of activation energy (<i>Eα</i>) as a function of the extent of crosslinking reaction, α. The average values of <i>Eα</i> calculated based on Kissinger and Friedman methods were 59.22 and 57.35 kJ/mol for the neat epoxy, 43.37 and 48.74 kJ/mol for the epoxy/Fe₃O₄, and eventually 50.48 and 49.19 kJ/mol for the epoxy/Ni_xFe_3−xO₄ nanocomposites. The partial replacement of Fe²⁺ ion sites in the Fe₃O₄ crystal lattice by the Ni²⁺ ions changed to some content the cure kinetic profile because of the fact that a lower level of energy was needed for curing by incorporation of Ni_xFe_3−xO₄ into the epoxy matrix. The rate of reaction calculated theoretically adequately fitted with experimental profiles obtained in DSC experiments.