The SAGE Encyclopedia of Menstruation and Society offers a wide-ranging, interdisciplinary look at how menstruation intersects with society, culture, health, and power. Drawing on scholarship from sociology, public health, queer studies, education, media, law, medicine, and more, this groundbreaking reference explores menstruation as both a biological process and a deeply social experience. Spanning historical and contemporary perspectives, the encyclopedia covers topics such as menstrual stigma, health equity, policy and advocacy, media representation, and product access. It also introduces readers to the growing field of critical menstrual studies and the influence of the global menstruation movement, showing how issues around menstruation connect to broader conversations on gender, justice, and human rights. With contributions from leading voices across the humanities, social sciences, and health fields, this reference is a vital resource for students, researchers, practitioners, and advocates seeking to understand menstruation in its full cultural and political context.