Having analyzed long-term series of photometric observations for UX Ori stars (UX Ori, SV Cep, and RZ Psc), we found evidence of possible periodicities in their variability. Multiperiod variability with a nonlinear interaction of periods (modulation) was suspected in SV Cep. The cyclic variability is probably caused by large-scale nonuniformities in the circumstellar dust disks. The mechanism for the generation of such nonuniformities is assumed to be the interaction of the circumstellar disk with the binary star or a planetary system.