The purpose of this study was to monitor insecticide resistance in populations of Sitophilus zeamais Motsch. and Sitophilus granarius (L.), Tribolium castaneum (Herbst) and Tribolium confusum du Val and Rhyzopertha dominica (F.) collected from different locations in Turkey. Three insecticides, malathion, chlorpyriphos-methyl, and pirimiphos-methyl were tested by using a discriminating dosage technique with impregnated filter papers. Mortality percentages were determined at the discriminating doses of insecticides. In Sitophilus spp. and Triboliim spp. discriminating doses for malathion and pirimiphos-methyl were used based on the IRAC susceptibility test method No:006. The others were used depending on the reference discriminating doses. The results obtained in these bioassays suggest that there was no insecticide resistance for chlorpyriphos-methyl in all tested species. For malathion, there was also no resistance other than Ankara strains of T. castaneum, S. zeamais and Karaman strains of S. zeamais. For pirimiphos-methyl, only the Ankara strain of R. dominica had resistance. Monitoring of resistance is important to adopt proper control measures for pest management for stored product pests.