Abstract: Several reports revealed that plasma level of essential trace elements like magnesium, calcium and phosphorus altered in diabetics. These micronutrients especially magnesium are suspected to have effective roles in pathogenesis and progression of diabetes. The studied subjects consisted of 96 diabetic volunteers (66.8%) females (mean age rate of 51.8±9.37) and (31.3%) males (mean age rate of 49.8±14.84) admitted in diabetes clinics of Gorgan city (Northeast of Iran). In these patients, the plasma level of Mg measured by simple sampling method due to a cross-sectional designated project. Glycated hemoglobin (HbA1c) also measured as a glycaemia control index. Hypomagnesia states were positive in 48 cases (50%). Housekeepers together with low educated individuals had significantly lower Mg plasma level as compared to other studied groups (p<0.05). No significant relationships were seen considering other variables. In respect to significant alterations of Mg plasma level that also reported in other such studies, it is recommendable to provide complementary supplication of such micronutrients for diabetics.