Secularisms: Negotiating boundaries between the religious and the secular is a Finnish-language edited volume that explores the multiplicity of secularisms in both past and present from a global perspective. The twelve authors represent five different disciplines: the study of religion, anthropology, theology, church history, and political history. The volume is divided into four parts, each united by a common theme. The first part focuses on concepts related to secularism and the roots of secularist thought in Christianity. The second part discusses the different histories of state secularisms through cases of the Soviet Union, Turkey, and Indonesia. The third part examines how religion is portrayed in the Finnish public sphere, with cases on women’s spirituality and debates within the peace movement. The fourth and final part focuses on the legacy of secularist colonial policies in the Global South, with examples from Madagascar, Ghana, and Brazil.