Background: The tooth fails to erupt completely or partially to its correct position in the dental arch and its eruption potential has been lost and will not eventually assume a normal arch relationship with the other teeth and tissues. Hence; the present study was undertaken for evaluating the prevalence of mandibular third molar impaction in adults. Materials & Methods: A total of 100 patients were included in the present study. Complete demographic details of all the patients were obtained. Clinical examination was carried out in all the patients. All the patients underwent radiographic analysis and OPG of all the patients was obtained. Patient’s information such as name, age, gender, etc. was recorded. A thorough clinical examination was done. Prevalence and type of impaction was recorded. All the results were recorded in Microsoft excel sheet and were analyzed by SPSS software. Results: Mesio-angular impaction was the most common type of impaction, found to be present in 55 percent of the patients. Non-significant results were obtained while correlating age and gender-wise distribution with type of impaction. Conclusion: Mesio- angular is the most common type of impaction among adults. Key words: Impaction, Third molar, Ramus relationship