Earthen architecture is one of the oldest forms of construction and is evidenced around the globe. This volume gathers the research and presentations from Terra 2022: 13th World Congress on Earthen Architectural Heritage, which brought together in Santa Fe, New Mexico, 350 conservation professionals and practitioners from fifty-two countries.Seventy richly illustrated papers, fifty-seven in English and thirteen in Spanish, address a range of conservation issues. Abstracts are provided in both English and Spanish for each paper. Themes covered include advances in research, strategies for archaeological sites, community-based care and decision-making, cultural landscapes, decorated surfaces, education, historic and modern buildings, conservation history, risks and vulnerabilities, and traditional materials and practices. Sections that draw on symposia held at the congress spotlight two recent architectural heritage initiatives: the rehabilitation of an urban settlement by the AlUla Old Town and Oasis Conservation Project in Saudi Arabia and the conservation and management of eight monumental enclosure complexes at the Hopewell Ceremonial Earthworks in Ohio.