EN
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.