Groundwater-surface water (GW-SW) interfaces (e.g., river corridors, floodplains, wetlands, and coastal zones) function as biogeochemical and ecological hotspots, regulating the distribution and transformation of matter and energy transported from headwaters to coasts. The spatial patterns and temporal dynamics of GW-SW interactions influence key processes such as water flow, nutrient cycling, heat and particle transport, and microbial metabolism. Understanding and predicting the complex drivers and controls of these interactions and processes, and transferring this understanding across systems and scales, requires integrating principles from hydrology, geomorphology, biogeochemistry, and aquatic and microbial ecology, coupled with novel experimental and/or modeling approaches. This 13th-annual GW-SW session aims to bring together a broad community of researchers to facilitate more holistic, multidisciplinary understanding and representation of GW-SW interactions and processes across varying systems and scales. We especially encourage submissions highlighting time-varying processes and dynamic/disturbed systems, coastal and estuarine interfaces, and microbial interactions.