<p>In this study, the temperature dependence of the electron paramagnetic resonance (EPR) spectra of MnGa₂S₄ single crystals was investigated in the range of 7.4–180 K. The signal lines were of symmetric Lorentzian shape, and their intensity, resonance line width (ΔH), relaxation time (τ), and g-factor variations were investigated. The signal intensity reaches a maximum in the range of 50–120 K, while at lower temperatures the spectra broaden and the intensity decreases, which is associated with spin freezing. These results are explained by spin correlations and phonon effects. The resonance linewidth broadens at low temperatures, indicating that spin–spin relaxation dominates. At 7.4 K, the relaxation time is approximately τ ≈ 2.22 × 10^–10 s. The temperature dependence of the g-factor also shows a corresponding trend—it is high at low temperatures (2.0063), and then remains stable and low (1.998) in the medium and high temperature range. These observations accurately reflect the magnetic phases that the system undergoes with heating—from the antiferromagnetic to the paramagnetic regime. At high temperatures, Mn²⁺ ions exhibit paramagnetic properties. The EPR analysis of MnGa₂S₄ single crystals enables precise assessment of their spin properties, facilitating the optimization of material selection for spintronic applications, such as the development of energy-efficient memory and logic devices.</p>