Geodynamic processes involve a wide scope of geoscience, from geological field observations to global mantle dynamics. The lithosphere acts as a link between the surficial geological tectonic deformation and deep mantle dynamics that govern fundamental Earth processes, including plate tectonics and the long-term cooling of Earth’s core (which in turn influences the geodynamo and Earth’s magnetic field). However, both the nature and dynamics of these spatial regions—lithosphere, mantle, core--remain poorly understood, and interactions among mantle processes, core evolution, lithospheric tectonics, geological deformation, and surface topography are areas of active investigation. In this broad and cross-disciplinary session, we welcome contributions from observational, experimental, and modelling studies that examine lithosphere, mantle, and core structure and dynamics across a range of spatial and temporal scales.