This is to study the relationship between TV watching and religious fidelity of the youngsters who live in Mashhad. This study has been done based on stratified sampling of the youngsters aged 18-24, considering appropriate sample size assignment. Paired-T tests, one-way analysis of variance, Pearson correlation coefficient, and multivariate regression analysis have been applied. The results have shown that watching more television programs would enhance the religious fidelity of the young. Thus watching more comedies, scientific – educational programs, religious ones, and news would advance the religious persistence among the young adults, though decreasing the interests in watching such programs on TV has the opposite effect on them.