Abstract: The ferromagnetic resonance (FMR) relations in magnetically anisotropic single-crystal ferrites with cubic symmetry have been reexamined. Detailed analyses are presented for idealized single-domain spherical specimens. The total free energy expression which includes the contribution of the first-and second-order cubic anisotropy was employed to derive general FMR formulas. The deviation between magnetization equilibrium direction and applied field direction is strictly taken into consideration. The theory of ferromagnetic resonance previously developed is extended to handle the case for the static magnetic field with an arbitrary orientation with respect to the orystallographic axes. The theory is applied to several practical examples and is found to yield results which are in good agreement with experimental data. On the basis of these methods, the cubic anisotropy constants and the effective gyromagnetic ratio for a material can be calculated from measurments in any crystal planes.