This chapter considers the treatment of religion in Puccini’s operas, with a strong focus on the two works with particular ecclesiastical themes, Tosca and Suor Angelica. It shows how Puccini drew upon the example of earlier models of religious representation in opera, by composers including Boito and Verdi. It considers the changing relationship between the Church and the state during Puccini’s lifetime, and the ongoing (though evolving) role of censorship laws. The use of liturgical scenes by Puccini and his contemporaries within the giovane scuola is discussed, with close analysis of stock techniques that are employed. The author concludes that Puccini’s works are made particularly effective by their habit of contrasting the secular and the sacred, using a more nuanced characterisation than is found in the works of his contemporaries.