Aim and Objective: The aim of the present study is to observe and analyze the morphological variations found in retromolar foramen and to assess the average width of Retromolar foramen. Material and Methods: In this study all available 72 dry, fully ossified adult mandibles from the department of Anatomy, Shri Guru Ram Rai institute of medical and health sciences, Dehradun, Uttarakhand north region of India were included without gender and age distinction. In 72 dry mandibles, the mandible which has retromolar foramen was studied for its diameter along with side preference. Result: The diameter of the Retromolar foramen varies between 0.53 to 1.64 mm and the mean Diameter of foramen was 1.01mm. The mean width of Retromolar foramen in right side was 1.01mm which is same as of Left side (1.01mm). Conclusion: The retromolar foramen and canal act as a common risk factor while performing conventional anesthetic techniques so the knowledge of the variation is relevant and after evaluating the width of the foramen which is not negligible surgeons must be careful about the anatomical structures that enter via Retromolar foramen, which can be injured during surgical approaches..