Abstract: In this study fungal contamination of five indoor public swimming pools in Zanjan was investigated using membrane filtration and sterile carpet sampling methods. Nine samples from water and related areas of each swimming pool were tested for the presence of the fungi and final diagnosis was done by slide culture technique to determine the species. The most common fungi isolated from swimming pools included Dermatophyte (Trichophyton mentagrophytes and Epidermophyton floccosum) 0.4%, Yeasts 21.8% and filamentous fungi 77.7%. Out of saprophyte fungi 24.8% were separated from pools margin, 22.6% from dressing rooms, 16.8% from pools water and 11.4% from shower- bath. Also yeasts fungi were separated from pools water 7.3% and from shower-bath 3.1% and Dermatophytes were separated from dressing room 0.2%. The fungal contamination of these swimming pools under specific condition could be an alarm for induction of infections and allergy in immunocompromised hosts.