Introduction: Mandibular foramen (MF) is located on the medial surface of mandibular ramus. The inferior alveolar nerve and vessels pass through it and supply the mandibular teeth. Along with the lingula of the mandible, it forms an important bony landmark during oral and maxillofacial surgical procedures and for identifying the site for injection of local anaesthetics. Objective: To study the morphometric variation in the position of the mandibular foramen and lingula and to compare the above measurements in males and females and age groups of __ampersandsignlt; 20 years and __ampersandsigngt; 20 years. Methods: 100 cone beam computerised tomography (CBCT) scans of full skull of both the genders and age group were studied in Ramaiah dental hospital and the location of the mandibular foramen and lingual were measured from the reference points: Base of the mandible, anterior and posterior borders of the ramus of the mandible, sigmoid notch and third molar. Results: The parameter that showed significant variation was; the mandibular foramen and lingula in females was more towards the base than males and among the age group of below 20 years of and adults above 20 years of age, children have their mandibular foramen nearer to the mandibular notch and the posterior border; indicating that the foramen moves downwards and anteriorly with growth. Conclusion: The position of both the mandibular foramen and lingula will vary with age and sex hence the surgeons should consider the age and sex of the patient during osteotomies and nerve block.