The aim of this study is to study occurrence of nosemosis in honey bees in Ordu Province and compare disease factors morphologicaly.Totally 200 adult bees were collected from ten localities in Ordu Province and examined for nosemosis. Spores of the disease factors were measured and photographed using an Olympus BX51 microscope with a DP-25 digital camera and a DP2-BSW Soft Imaging System.Nosemosis was observed in all examined localities. The infection rate varied from 25 to 85%. The disease was observed with the lowest rate (25%) in Mesudiye and with the highest rate (85%) in Fatsa. An average infection rate was found as 44%. Infection level reached to 85% in Ünye. Significant differences were detected between spore morphology of the disease factors.Presence of nosemosis in Ordu province has been studied extensively. The disease is very common and very high in the region where it occurs. According to spore morphology is determined that the disease can be caused by two factors.