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The electron paramagnetic resonance of Mn^{2+} in Tl_{2}Mg(SeO_{4})_{2}·6H_{2}O single crystals has been observed at 298 K and 77 K at ~9.45 GHz. Mn^{2+} has been found to substitute for Mg^{2+} exhibiting two magnetically inequivalent complexes. The electron paramagnetic resonance spectra have been analysed using the spin Hamiltonian appropriate for rhombic symmetry.