Background: Sinonasal masses (SNMs) are a pretty frequent medical entity that take place amongst patients of all age groups. Their symptoms and signs regularly overlap, as a result a diagnostic predicament exists. A right analysis is prudent for instituting right cure and anticipating recovery. The purpose of this analysis was to find out the incidence & variety of nonneoplastic & neoplastic lesions of nasal cavity & paranasal sinuses. Objectives: The aims of this study were to determine the histopathological spectrum of sinonasal masses in patients coming to a tertiary care hospital and also to compare the findings with other studies. Methods: This analysis was carried out on 150 patients with SNMs presented to the Department of Histopathology at National Institute of ENT & Hospital, Dhaka, Bangladesh over a period of about two years (September 2016 to May 2018). Their demographic data, clinical profile and histopathological diagnosis were analyzed. Results: A total of 150 cases were studied. The neoplastic lesions formed the larger group, 87 cases (58%) followed by nonneoplastic lesions, 63 cases (42%). Nonneoplastic lesions were more common in the age group of 2nd & 3rd decades while neoplastic masses were prevalent in the 2nd & 6th decades. The lesions of nasal cavity & paranasal sinuses had a stronger predilection for males as compared to females with the male to female ratio being 2.33. Conclusions: The majority of sinonasal masses sent for histopathology are inflammatory, a variety of benign & malignant lesions may present as nasal masses. All nasal masses must need thorough histopathological examination.