Background: Prayer is considered as the most comprehensive type of God's serving and relation. Fidelity to prayer and its condition results in soul evolution and the optimization of personal and social life style of man. The spiritual health as a state of spirit that has some ranking is achieved from the relation to God and confers a healthy and purposeful life. Therefore, with the aim of evaluating the correlation between the fidelity in prayer and the ranking of spiritual health, a field study was carried out in Kashan during 2018. Materials and Methods: The participants of the study were the university students, clergy and the people of Kashan. The sample size was 100 in each group with a convenient non-randomized sampling method. The data collection tools were the fidelity in prayer (Kronbach's Alpha coefficient: R=0.799) and Paloutzian & Ellison's spiritual health questionnaires (Kronbach's Alpha coefficient: R=0.82). The data were analyzed using SPSS software at a significance level of 5% and the Pearson's correlation coefficient. The correlation analysis was used. Results: A direct correlation was seen between fidelity in prayer and the promotion of ranking for spiritual health (RT=0.560, P=0.001). Moreover, with a change in gender, marital status and the age range, the effect of fidelity in prayer on spiritual health was continued. Conclusion: The more was the fidelity of people in prayer, the higher was their spiritual health. In addition, the less was the age of the people, the less was their fidelity in prayer.