The electron-spin resonance (ESR) was measured for trivalentium neodymium, dysporsium, erbium, and ytterbium in the single crystal samples of lithium niobiate. The measurements were made at x-band frequencies in the temperature range from 4 K to 50 K. Distinct hyperfine lines due to isotope 167Er, and weak hyperfine lines due to isotopes 161Dy, 163Dy, and 171Yb, 173Yb were observed. The g factors and hyperfine parameters were obtained by use of the spin Hamiltonian and fitting to angular dependence of observed spectra. Moreover for LiNbO3:Nd3+ g factors were verified for powder samples. According to these results some conclusions concerning sites in which rare earth ions are placed in the crystal lattice of LiNbO3 can be drawn.
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