Background: Increased nosocomial infections are among the major health issues which most hospitals are involved in at present. Out of them, airborn fungal spores are significant contaminating sources of operating-room equipment and intensive care units that can potentially cause a wide range of nosocomial infections. Opportunistic fungi are among the most common and most fatal infections.Methods: In current survey carried out during June, July and August 2001, 59 plates from air and culture of 83 samples from operating-room equipment and special wards of four hospitals were accomplished on saboro Dextrose Agar culture media.Results: 70% of plates were tested to be positive for fungi. In this study, 568 colonies were isolated from 21 different types of fungi. Dominant fungi were, Aspergillus (40.1%) , Alternaria 19.78% , penicillium 18.18%, fusarium 13.36%, cladosporium 9.62%, Rhizopus 3.20%, fuma 2.13%, Nigrospora 1.6% stampfillium 0.53%, respectively. Among the yeast type fungi, yeast had the highest frequency 47.75% and the others were as follows: Candida - Spp 26.91%, Rodutrulla 17.76%, and Geotrichum 1.31% respectively. The highest colony rate was isolated from hospital III, and out of investigated units, the highest colony rates were isolated from the floor of the wards (78.94%) and air (39.62%) and more importantly amboback (27%), whereas the lowest rate belonged to shockdence and anesthetic machines (3.61%).Conclusion: Based upon determined frequency rates and various fungal spores in the air and equipment available in operating-room and intensive care units, the need for applying appropriate prevention and control procedures in order to omit these organisms and reduce the nosocomial infection is evident.