An operationally simple, efficient and environmentally benign synthetic method to bis(indolyl) methanes has been developed in good yields (80-96%) by electrophilic substitution reactions of indole with aldehydes or ketones in methanol in the presence of 5 mol% of poly (ethylene-glycol) (PEG) supported sulfonic acid with respect to indole under mild conditions. Recovery and recycling of the poly (ethylene-glycol)-supported catalyst were also described.