The position of the hyoid bone is related to vi- tal functions. The aim of this research was to analyze the change in the position of the hyoid bone related to the surgical movement in orthognathic surgery. 52 subjects were included; the diagnosis was determined according to facial analysis, being identified as class II or class III facial deformity. The subjects were treated by maxillary and mandibular surgery without chin surgery; cone beam computed tomography were realized pre-surgical and post-surgical to perform the analyses. Statistical studies was according to the type of va- riable considering a value of p<0.05 to obtain significant differences. The results demonstrated changes in the position of the hyoid bone at different levels; in class II subjects a significant change was observed in the vertical position of the hyoid bone and there was a rise of 4.45 mm (p=0.001); in class III subjects, no significant relationships were observed in terms of horizontal or vertical position. The transverse distance showed significant changes, reducing by 3.62 mm in the post-surgical stage (p=0.008). It is possible to conclude that orthognathic surgery causes changes in the location of the hyoid bone.