Introduction: Based on past studies, it has been found that congenital deafness is weak in maintaining balance, strength, coordination, and endurance. So, the reinforcement of different aspects of physical fitness of these individuals should be considered in order to improve their quality of life. So, the purpose of present study was to assess the Effect of Swiss Ball Exercises on Trunk Endurance, and Balance Functions in Student with Congenital Deafness. Methods: The statistical population of the study consisted of students with congenital hearing loss in Qazvin, 24 of who were selected and were randomly divided into intervention and control groups. Functional tests were used to assess trunk endurance and balance. The intervention group performed the Swiss Ball training but control group continued their routine daily activities. Pre-test and post-test were performed by both groups before and after the training program. Independent ttest and covariance analysis were used to analyze the data. Result: According to the results of ANCOVA, there was a significant difference between the control and intervention groups in Trunk Endurance (p = 0.001), Static (p = 0.001) and Dynamic Balance (p = 0.001) tests after six weeks. Conclusion: Seems Swiss Ball training can provide a strong base for lower extremity movements by strengthening the core region of the body, thereby improving trunk endurance and balance functions in the deaf.