The fungal contamination of four indoor public swimming pools was investigated using membrane filtration and carpet sampling method. Sixty samples from water and related places of each swimming pool were tested for the presence of fungi in different seasons during one year. The most common fungi recovered were as follows: Cladosporium sp. 34.9%, Penicillium sp. 31.2%, Rhizopus sp. 9.7%, Aspergillus sp. 9.2%, yeast species 6.2% and unknown filamentous fungi 8.8%. Also Trichophyton mentagrophytes were isolated in nine cases from dressing rooms and bathrooms of swimming pools. The fungal contamination of these swimming pools under specific conditions could be an alarm for induction of infections and allergy in compromised hosts.