Mint is one of the most important medicinal and aromatic plants in the world, however, the effects of shading levels on growth and quality of mint accessions have not been well documented. Therefore, the purpose of this experiment was to determine the effects of five shade levels (0 (full sun), 20-30% shade, 40-50% shade, 60-70% shade and 80-90% shade) on nine mint genotypes ( Karaj, Hamedan and Esfahan ( M.longifolia ), Tabas, Ghazvin and 7-1( M. piperita ), 2-1, 11-3 and Bojnord ( M. spicata ) intensities. A split plot desigyn with three replications was conducted during the 2012-2013 growing season. Three rhizomes of each genotypes were planted in the pots and after full establishment, pots were put under respective shade level at the Isfahan University of Technology. Plant height, shoot fresh and dry weights, root fresh and dry weights, number of leaves and number of steems per pot, leaf area, leaf total chlorophyll, a and b and carotenoid contents, essential oil content and yield were measured. The results plant height, shoot fresh weight, root fresh and dry weight, leaf chlorophyll a content, carotenoid content, essential oil and yield increased under 20-30% shading, however number of leaves, number of steem, leaf area chlorophyll b content were the highest under control. The highest and lowest plant heights were measured in 7-1 under 20-30% and in Ghazvin under 80-90% shades, respectively. The highest and lowest shoot numbers were noted in Esfahan under sun full and Hamedan under 80-90% shades, respectively. The highest and lowest number of leaves were noted in Hamedan under sun full and 80-90% shades, respectively. The highest and lowest leaf area were distinguished in Bojnord and Ghazvin, respectively. The highest and lowest shoot fresh weights were measured under 20-30% shade in Karaj and under 80-90% shade in Ghazvin, respectively. The highest and lowest shoot dry matters were detected in Esfahan under full sun and Hamedan under 80-90% shade, respectively. The highest and lowest root fresh weights were recorded for Karaj under 20-30% and Ghazvin under 80-90% shades, respectively. The highest and lowest root dry matters were measured for Karaj under 40-50% and Ghazvin under 80-90% shades, respectively. The highest and lowest chlorophyll a content, were recorded in 2-1 and Bojnourd genotypes, respectively. The highest and lowest chlorophyle b were noted for Esfahan under full sun, and Hamedan under 80-90% shade, respectively. The highest and lowest carotenoid content were cognizanced in Ghazvin under 20-30% shade and Bojnourd in 80-90% shade levels, respectively. The highest and lowest percent essential oil, were recorded in Tabas under 20-30% and Karaj under 80-90% shade levels, respectively. The highest and lowest, yield essential oil were registered in Esfahan under 20-30% and Karaj under 80-90% shade levels, respectively. Maximum and minimum essential oil percent were measured in 1-2 and Hamedan, respectively. According to results Tabas, Esfahan, Karaj, 1-2 and 11-3 produced highest yield essential oil under full sun, 20-30% 40-50%, 60-70% and 80-90% shade levels, respectively. Key Word : M. longifolia , M. piperita , M. spicata , percent essential oil, yield essential oil