Geodynamics is the aspect of geophysics dealing with dynamics of the Earth. It applies physics, chemistry and mathematics to the understanding of how mantle convection leads to plate tectonics and geologic phenomena such as seafloor spreading, mountain building, volcanoes, earthquakes, faulting and folding. In fact this aspect of Earth Science research is the backbone for all studies related to applications of geo-information for socio-commercial benefits. NGRI has a long history of carrying out research in geodynamics utilizing seismology, gravity, magnetic, magnetotelluric, geochemical data to probe the structure and processes in different distinct geological terranes like subduction/collision zones, Precambrian cratonic regions, passive continental margins, aseismic ridges. Path breaking contributions to geodynamics that have originated at NGRI include: doubling of crust under the Himalayas, nature of subduction in the Andaman-Nicobar trench, structure and evolution of the Western, Eastern Dharwar cratons and SInghbhum craton, which are some of the oldest pieces of continents in the world.