Verticillium wilt is a serious disease of cotton in northern Iran. It is favoured by cool air and soil conditions. Control measures include cultural practices and the cultivation of regionally adapted tolerant cultivars but the effectiveness of these measures depends on the that are to the causal strain of the disease and the inoculum level in the soil. Two of the twenty five cultivars released by the Institute of Cotton Research in Iran are tolerant to the disease. In addition, trials have been conducted over a five year period at the Kordkouy Research Station in northern Iran of eight Mediterranean cultivars from Greece, Bulgaria and France. Zeta 2 proved more tolerant than the control Sahel with Sindos 80 also giving good results.