The results of cycloalkylation of phenol with 1-methylcyclopentene and 1-methylcyclohexene in the presence of phosphoric acid-impregnated zeolite are presented. Optimal conditions for the synthesis of 4(1-methylcycloalkyl)phenols were found. It was shown that the yield of the desired products under the optimal conditions is 86.4-89.6% of the theoretical value. The structure of 4(1-methylcycloalkyl)phenols was established by means of spectral and chemical analysis techniques.