Aims: To find out the correlation between clinical diagnosis and pathological diagnosis of various sinonasal masses in the North-East Indian Population. Materials and methods: This study is a hospital-based observational cross-sectional study done over a period of 1 year (2020–2021) in the ENT department of a tertiary care Hospital, in North-Eastern India. A total of 40 patients who presented with sinonasal masses to the ENT OPD of our hospital were included in the study. After a detailed clinical history and examination; nasal endoscopy, radiological investigations and biopsy (wherever indicated) were performed. Whenever any surgical procedure was done, the tissue was sent for histopathological examination (HPE). Results: In our study, in 31 cases (77.5%), the clinical and pathological diagnoses were the same, whereas in 9 cases (22.5%), there was discrepancy between clinical and pathological diagnosis. This correlation was statistically significant with p-value of 0.001. Conclusion: We conclude that by thorough clinical, endoscopic, and radiological evaluation we can come to a provisional diagnosis but HPE is necessary to confirm the diagnosis and hence helps in the proper and early treatment of sinonasal mass. Clinical significance: Knowledge of the clinicopathological correlation of sinonasal mass in the North-Eastern Indian population will take us a long way in improving the quality of medical care in this region.