Background: Abnormal Uterine Bleeding (AUB) is defined as any bleeding that does not correspond with the frequency, duration or amount of blood flow of a normal menstrual cycle. Endometrial biopsy is important in perimenopausal age group women (40-55 years) to rule out endometrial pathology and malignancy. This study was done to assess Clinicopathological aspects and different histopathological patterns related to Abnormal Uterine Bleeding as no studies have been done in this region of Karnataka, India