Background: Sinonasal area is a host to various neoplastic and non- neoplastic lesions. Thernpresenting symptoms of sinonasal lesions are similar and pose difficulty for diagnosis based onrnclinical features and advanced imaging modalities, which makes histopathology the principalrndiagnostic tool approach for these lesions. The aim of this study is to determine the variousrnhistopathologic types of Sinonasal lesions, their classification and relative distribution withrnregards to age and sex in our setting. rnMaterials and Methods: A retrospective cross-sectional descriptive study conducted on 306rncases of sinonasal lesions over the period from January 2016 to August 2020. All the sinonasalrntissues were received and diagnosed at histopathology section of Department of Pathology inrnTikur Anbessa Specialized Hospital, Addis Ababa, Ethiopia. The Pathology reports wererncollected from the pathology data archives; and the variables of study were extracted by using arndata extraction sheet, and data analysis was done using SPSS version 26.0.rnrnResults: Most affected age group was 21-30 years 81(26.5%). Male predominance wasrnobserved with M: F ratio of 1.4:1.Nasal cavity was the commonest anatomical site involvedrn237(77.5%).There were 137(44.8%) Non-neoplastic lesions and 169(55.2%) Neoplastic lesions.rnInflammatory Sinonasal Polyps 100(73.0%) were the most common among non-neoplasticrnlesions; inverted Sinonasal Papilloma 34(41%) the most common among the benign neoplasticrnand squamous cell carcinoma and nasopharyngeal carcinoma accounting for 21(25.6%) casesrneach, were the commonest malignant lesions. rnrnConclusion: clinical findings and advanced image modalities can reach to a presumptiverndiagnosis for the sinonasal lesions but histopathology remains the gold standard for categorizingrnand diagnosis of non-neoplastic and neoplastic lesions of sinonasal tract.