Pag sheep are reared extensively on karst pastures, and milking takes place mainly by hand in buckets in the corral or on the pastures themselves. Due to this method of breeding and milking, a certain amount of dirt, i.e. hair, straw and animal feces, gets into the milk, which greatly impairs the quality of the milk, and pathogenic microorganisms can get into the milk. Therefore, the aim of the study was to determine the number of microorganisms and somatic cells in the raw milk of Pag sheep and to determine which bacteria in milk are the most common causes of mastitis in sheep. The study was conducted in 10 flocks of sheep, from February to May. The analyzes were performed at the Croatian Veterinary Institute in Zagreb. The study found that 50% of the samples had a somatic cell count of less than 500,000 / mL, and the number of microorganisms in 68% of the samples was above 1,000,000 cfu / mL. Streptococcus spp., Staphylococcus spp. and E. coli were also detected in the milk. The results did not indicate the existence of inflammation but the subsequent contamination of milk with microorganisms. Milking hygiene needs to be improved in order to obtain high quality milk.