Objectives: To compare the Electromyographic (EMG) activity of the masseter, anterior temporal muscles and mentalis in different vertical facial types. Materials and Methods:Clinical examination, cephalometric analysis, and Electromyographic examination were performed in 60 volunteers ranging from 16 to 26 years old. The volunteers were classified on the basis of their vertical facial characteristics into three groups__ampersandsignmdash; hyperdivergent, normodivergent and hypodivergent__ampersandsignmdash;by the grouping analysis. The EMG records were obtained with four different positions Postural rest position of the mandible ,Maximal voluntary clenching ,Maximal mouth opening ,Swallowing The equipment used for EMG reading was grass polygraph and amplifier (Nicolet Viking Vt, ) and amplified signals were simultaneously recorded on the paper (Hewlett Packard, CA). Each direct EMG trace was converted to a mean voltage trace by an electronic averaging circuit connected to the polygraph. The speed used for recording was 500 mm/s. At the beginning and the end of each trace recording, Calibrating test and baseline recordings were performed. Results:It was found that the highest mean amplitude was in Group I (416.6 + 97.1) followed by Group II (389.5 + 61.3) and the lowest mean value was in Group III (374.6 + 38.4). Statistical analysis by one-way ANOVA showed that there was no significant difference between Group I, II and III for position ?P1__ampersandsignlsquo; in Muscle ?M1__ampersandsignlsquo; (P=0.41). The statistical package SPSS (Statistical package for social science, version 4.0.1) was used for statistical analysis. Mean and standard deviation were estimated from the sample. The tests that were used for the statistical analysis were One Way Anova, Multiple Range Test by Tukey- HSD, Students ?T__ampersandsignlsquo; Test. Conclusion: In our study, the EMG revealed increased activity of masseter during clenching and increased activity of mentalis during swallowing in hypodivergent group when compared with normo divergentand hyperdivergent group. There was not much difference in muscle activity in the hyperdivergent group.