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. The present study was conducted to assess the histopathological pattern of endometrial biopsies in patients with abnormal uterine bleeding (AUB). Materials & Methods: 296 cases of abnormal uterine bleeding were selected. The functional and organic reasons of AUB were recorded. Histopathological study of endometrial patterns and age specific correlation was done. Results: The age group 21-30 years had 48, 31-40 years had 144 and 41-50 years had 104 patients. The difference was significant (P< 0.05). The cause of AUB was functional in120 and organic in 176 patients. Histological diagnosis was proliferative phase in 48, simple hyperplasia without atypia in 84, atrophic in 40, secretory phase in 24, chronic endometritis in 40, endometrial polyp in 32, complex hyperplasia with atypia in12, disordered proliferative phase in 8, and endometrial carcinoma in 8 patients. The difference was significant (P< 0.05). Conclusion: The gold standard diagnostic method for assessing AUB is endometrial histopathological investigation. Endometrial pathologies as cause of AUB are age related.