An investigation was carried out over a year in the village of Chelow, Hormozgan Province, southern Iran, to study the efficacy of CDC light traps for sampling malaria vectors. The CDC light traps were useful in determining the seasonal and habitat distribution of Anopheles stephensi and An. fluviatilis, the primary and secondary vectors of malaria, in Chelow, as well as other mosquitoes in that area. Light traps compared favorably with other adult mosquito collection techniques for detecting the presence of vectors during periods of low density. In Iran, time and labor-saving features and flexibility for use in different situations make CDC light traps a useful sampling tool in the entomological assessment of malaria control programs.