Darkness, Design, and Biodiversity examines the overlooked crisis of light pollution, advocating for the protection of our planet’s natural night. It offers a critical examination of how modern lighting practices harm biodiversity and introduces innovative solutions for creating protective darkness. Through three core paradigms, the book addresses the causes and solutions of light pollution, presents technical outdoor lighting strategies, and explores the design of nocturnal spaces. Aimed at a broad audience, from students across various disciplines to laypeople and professionals, it serves as both an informative resource and a call to action. By combining insights from ecology, architecture, engineering, and more, this concise work encourages readers to contribute to preserving nature’s diversity by rethinking our approach to artificial lighting and darkness.