This session encourages dialog on Community Science and Citizen Science (CCS) cutting across research, practice, and professionalization of the field. In Community Science, scientists and communities do science together to advance one or more community priorities. It encourages communities, particularly historically marginalized and oppressed communities, to guide, participate in, learn from, and benefit from science. Citizen Science, similarly, engages the public to collaborate with scientists in research and monitoring, from local to global investigations. We welcome: 1.) examples illustrating the importance, value and benefit -- to both research and the public -- of these growing fields; 2.) submissions show how scholars and practitioners are building the field through activities such as graduate and undergraduate education, fellowships, and training resources; and 3.) research focused on CCS, for example on participant outcomes, linking with policy and management, or design strategies -- particularly in the context of the geosciences.