Introduction: Histological examination of the submitted endometrial tissue remains the standard diagnostic procedure for the assessment of abnormal uterine bleeding. In addition, accurate histopathological diagnosis facilitates the implementation of optimal treatment strategies. Histopathological diagnosis varies according to the age. Methodology: This was a study on histopathology of endometrium in AUB, undertaken in the Department of Pathology over a period of two years. Material for the study consisted of dilatation and curettage samples of endometrium obtained from patients presenting with AUB, who were either attending OPD or admitted in hospital, which was sent for histopathological study to the Department of Pathology Results: Among 140 functional cases of AUB, secretory endometrium and proliferative endometrium were the most common patterns and were seen in 54 cases (39%) and 35 (25%) cases, respectively. This was followed by 27 (19%) cases of disordered proliferative endometrium,17 (12%)cases of AUB due hormonal effect and 7 (5%)cases of irregular shedding. Conclusion: Amongst the 78 organic lesions causing AUB, endometrial hyperplasia was the most common and seen in 62 (73%) cases. The other organic causes of AUB observed in this study include 4 (5%) cases of endometritis 4 (5%) cases of endometrial polyp and 8 (9%) cases of malignancy. Key words: Endometrium; Abnormal Uterine Bleeding; endometritis.