Background: Functional appliance therapy has gained popularity and has been used with substantial amount of success in the management of skeletal class II malocclusion. Generally, functional appliances are utilized for the correction of retruded mandible in growing individuals. This study was used to compare and plot the skeletal and dental changes using fixed and removable functional appliance therapy in the treatment of class II malocclusion. Materials and methods: The study population consist of 50 growing individuals who have undergone treatment for skeletal class II malocclusion. The group are divided in to herbst group (n=25) and twin block group (n=25).The lateral cephalograms obtained from these patients and changes analyzed using students paired t –test. Results: The skeletal and dental changes showed statistically significant improvement in antero-posterior maxillomandibular measurement in both groups and but herbst unlike twinblock produce greater dental effects. Although treatment duration was faster in fixed appliance group, both studies showed improved facial profile. Conclusion: The treatment effects of both the functional appliances used in this study for skeletal class II cases are satisfactory and can effectively use for correction of retrognathic mandible in adolescents.