Background: Gonial angle shows a great amount of individual variation based on age and type of malocclusion. The present study was conducted to assess reliability of panoramic radiograph to determine gonial angle. Materials & Methods: 90 subjects of both genders were selected. Orthopantomograms were taken in all subjects. Gonial angle was calculated from the intersection of two planes, i.e; plane of the ramus of the mandible and body of the mandible. In the lateral cephalograms, the gonial angle was measured at the point of intersection of the plane tangential to the lower border of the mandible and another line tangent to the distal border of the ascending ramus and the condyle. Results: Out of 90 patients, males were 40 and females were 50. The mean gonial angle in lateral ceph in males was 118.2 degree and on OPG was 119.3 degree. The mean gonial angle in lateral ceph in females was 124.5 degree and on OPG was 122.7 degree. The difference was significant (P