Since the early 2010s, several national networks and initiatives have been established to connect different citizen science projects in their respective countries, often across scientific disciplines. These platforms pursue several goals, such as: (1) displaying citizen science projects to an interested public; (2) connecting citizen science actors to foster innovation and learning; and (3) lobbying for citizen science in their respective contexts. However, many of these initiatives face a number of challenges. These include, but are not limited to: funding; organization of workloads (e.g. organizational structure, IPR); and framing of citizen science (e.g. transparent criteria on which projects are listed on online platforms, and which are not). In the Citizen Science Networks working group, representatives from established and emerging citizen science networks are collaborating to tackle some of these challenges. The group’s first goal was to frame transparent criteria that help networks to decide, in a transparent and impartial way, if a project should be listed as citizen science on online platforms or not. This will facilitate the exchange of projects between networks and make projects more comparable. Cite this document as: Dörler, D; Heigl, F; Brounéus, Fredrik; Cieslinski, Marika; Duerinckx, Annelies; Gijsel, Liesbeth; Grossberndt, Sonja; Kragh, Gitte; Luis, Cristina; Tiago, Patricia; European Citizen Science Association (ECSA) Working Group Citizen Science Networks. 2022. Criteria for listing citizen science projects on citizen science online platforms. Vienna. DOI: 10.5281/zenodo.7249085