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The results of electron paramagnetic resonance (EPR) studies of Dy 3+ ions in lead thiogallate PbGa 2 S 4 single crystals have been presented. It has been shown that the ground state of these ions corre sponds to the lowest Stark sublevel Γ 6 of the term 6 H 15/2 . The spectra are well described by the axially sym metric spin Hamiltonian with the effective spin S = 1/2 with the factors g || = 15.06 and g ⊥ = 2.47. The Dy 3+ ions substitute Pb 2+ ions in the crystal lattice of PbGa 2 S 4 . The observed hyperfine structure has allowed to unambiguously interpret the EPR spectra. The hyperfine interaction constants of two odd isotopes of dyspro sium in lead thiogallate single crystals have been found to be A || = 675 × 10 -4 cm -1 and A ⊥ = 111 × 10 ⎯4 cm -1 for 163 Dy and A || = 472 × 10 -4 cm -1 and A ⊥ = 77 × 10 -4 cm -1 for 161 Dy.