With clear explanations and a broad range of entries, this book serves as both a foundational educational tool and a celebration of humanity.

The Nonbinary Encyclopedia is a comprehensive reference work of nonbinary and gender-diverse history and culture around the world and throughout time. Drawing from scholarship and the authors' lived experience, it offers readers nuanced and accessible insights into how gender has been embodied, expressed, and regulated across societies and time periods. Written by a team of academic and nonbinary authors, the encyclopedia brings together historical figures, contemporary movements, medical advancements, theoretical frameworks, and global traditions that do not fit into a binary model of gender.

The Introduction covers philosophical and conceptual topics and provides an overview. The body of the Encyclopedia features over 100 entries with a global range: nonbinary identities in cultures around the world today, medical issues, terminology, legal and political subjects, nonbinary people and traditions in history, and more. References at the end of each entry point the reader to further materials. Written in an accessible manner, this work provides an ideal entry for those wanting to know more about this important subject.

Gwyn Uttmark (they/she) is an anthropologist, scientist and engineer whose work focuses on gender affirming medicine, trans internet culture and autonomous care. They are the author of an autobiographical memoir Running From Slow Tigers (2020) and have served on various research teams at Stanford University, the University of Wyoming, and Colorado State University.

Brent L. Pickett (he/him) is the dean of University of New Mexico-Los Alamos, USA, and a professor of political science. He is the author of The Transgender Encyclopedia (2024), the Historical Dictionary of Homosexuality (2022), and numerous articles in the field of political philosophy. He has served as a visiting professor at institutions in China, Germany, and the Republic of Georgia.

Elliott Orrin Hinkle (they/them) is a writer, educator, and consultant, based in Wyoming, USA, whose work centers LGBTQIA2S+ youth, systems change, and gender justice. As the founder of Unicorn Solutions, Elliott brings over a decade of experience in advocacy, training, and policy leadership.