An exhaustive literature search was undertaken to find studies on mortality rates among clergy. A total of twelve studies, published between 1959 and 2000, were identified that examined mortality among American and European clergy. All but one of the reports found lower all-cause death rates for clergy compared to the people in general population of similar age. Protestant ministers consistently were found to have more than a 25% mortality advantage in various studies. Catholic nuns had a mortality advantage of roughly 20%–25%, whereas the mortality advantage of Catholic priests was just over 10%. Possible factors contributing to the lower death rates of clergy are discussed.