Background: Menopause is that point in time where permanent cessation of menstruation occurs following the loss of ovarian activities. Ultrasonography is simple, non-invasive technique, highly acceptable to the patient. It offered detailed delineations of the uterus and its myometrium, endometrium and vessels. So, several uterine disorders can be evaluated by ultrasound.. BMI is an inexpensive and simple method of classifynging for weight categories that may lead to heath troubles Objective: To investigate the relationship between ultrasonographic endometrial thickness and morphology to body mass index in postmenopausal women. Materials and Methods: Three hundred postmenopausal women (mean age, 59.95+3.73 years; range 55-65) were studied. Age, years since menopause and BMI characteristics were recorded. The relationship between ultrasonographic endometrial thickness and and morphology to baseline characteristics was evaluated in each woman. Results: BMI was positively correlated with endometrial thickness (r= 0.841), but age and years since menopause were negatively correlated (r= -0.224) (r= -2.84). Conclusion: There is positive relationship between BMI and endometrial thickness in asymptomatic postmenopausal females.