Improved understanding of physical and ecosystem changes in Earth’s shallow water regions is crucial to understanding the impacts of climate change, sea-level rise, and growing human populations on coastal, lacustrine, and polar environments. Recent interest in optical retrieval of shallow-water bathymetry is being driven by the availability of multispectral satellite imagery at global scale, while access to airborne bathymetric lidar from conventional and drone-based platforms supports higher-resolution bathymetric mapping over smaller areas. Additionally, NASA’s ICESat-2 satellite laser altimeter is now acquiring bathymetric profiles from pole to pole, making new observations of bathymetry in remote locations and providing synoptic in situ calibration data for multispectral depth estimation. We welcome presentations that highlight new multispectral/LiDAR/altimetric observations of shallow water bathymetry, individually or in combination; new or improved algorithms for bathymetric estimation; optimal fusion of in situ and remote observations; and new scientific discovery enabled by any of the above.