The aim was to assess the reliability of orthopantomogram in evaluating vertical facial pattern using gonial angle A cross–sectional study was conducted at the Department of orthodontics, Vokkaligara Sangha Dental College, by using 99 radiographs of the patients in the form of orthopantomogram and lateral cephalograms. The sample included 53 female and 46 male subjects. The subjects were divided into three groups– skeletal class I, class II and class III, each group comprising of 33 subjects. The gonial angle was traced manually by drawing a tangent to the posterior ramus and another tangent to the lower border of the mandible.The mean gonial angle was 110.86˚ on orthopantomograms and 111.34 ˚on lateral cephalograms.. The results prove that Orthopantomogram can be used as a valuable ancillary diagnostic tool for gonial angle evaluation without superimposition of anatomic structures