As gay men and lesbian women increasingly gained recognition and acceptance in twentieth-century literature and film, and subsequently in social and political movements, the Catholic Church reacted by subtly moving away from its overt condemnation of homosexuality as an urgent moral problem and toward tacitly shunning homosexuality as an “unspeakable vice.” In this revealing history, Francesco Torchiani reconstructs the Catholic Church’s shifting attitudes toward homosexuality during this period by drawing on a vast array of internal documents and external accounts. This monograph expands the scholarship on the relationship between Catholicism and homosexuality in terms of both method and content, ultimately concluding that the Catholic Church continues to wholeheartedly condemn homosexuality despite making genuine efforts to reflect on and understand its social and cultural impact. The Unspeakable Vice therefore sheds new light on and places into historical perspective the questions the Catholic Church continues to reckon with regarding its role in contemporary society.