Magnetic susceptibility and the Faraday effect in orthorhombic DyAlO 3 single crystals were studied along the crystallographic b -axis, the axis of easy magnetization, in a temperature range 78–300 K. The Faraday rotation was measured on the basis of the temperature and spectral dependencies of the rotation angles θ of the major axis of the ellipse of light radiation polarization in a wavelength range 440–750 nm. At a wavelength of 506 nm, the dependence of the Verdet constant V on the magnetic susceptibility χ M was observed to be linear in a temperature range 85–300 K, and the paramagnetic Verdet constant C p was calculated. A comparative analysis of the constants C p and the effective frequencies ω 0 of allowed transitions in cubic R 3 Al 5 O 12 garnets and R AlO 3 ( R = Tb 3+ , Dy 3+ ) orthoaluminate crystals was carried out in terms of the local site symmetry for rare-earth ions. The possibility of practical magneto-optical applications of the DyAlO 3 crystals is briefly discussed.