The Working Group (WG) "Co-Creating Water Knowledge" of the HELPING Initiative of IAHS (https://iahs.info/Initiatives/Topic-for-the-Next-IAHS-decade/helping-working-groups/) is active as a community of practice of researchers on different topics, working in understanding how the concept of co-creation can be used to integrate local and indigenous knowledge in hydrological sciences, and how hydrological knowledge can be integrated into them. This Splinter Meeting is an in-person opportunity to meet the WG and follow up on its activities.