This chapter investigates the tectonics of the Coorg Block and adjoining shear zones in Southern Granulite Terrane (SGT) located along the southwestern part of India. The Coorg Block exposed along the Kasaragod district of Kerala and parts of Kodagu district in Karnataka states covers ~ 3000 km2. It is the northernmost block of the SGT and is separated from the Western Dharwar Craton to the north by a major lineament called the Kasargod-Mercara Shear Zone (KMSZ) and from the Nilgiri Block to the south by the Moyar Shear Zone (MSZ). Charnockites and tonalite-trondhjemite-granodiorite (TTG) gneisses are the dominant rock types along with granites, syenites, anorthosites, metapelitic schists/gneisses, metagabbros, quartzo-feldspathic gneisses, etc. Structurally, the Coorg Block is a high-grade terrane that has undergone at least three phases of deformations. The KMSZ to the north is composed of charnockites, mylonites, mafic granulites, metagabbros, TTG gneisses, kyanite/sillimanite-bearing metapelites, anatectic granitoids, syenites, quartz-mica schists, etc. The dextral shear zone trends E-W in the western part of the stretch, and it curves to the south in the middle segment and terminates at the MSZ in the south near Iritty. The major lithologies in the MSZ to the south of Coorg Block are pyroxene granulites, metapyroxenites, quartzites, hornblende-biotite gneisses, deformed/foliated granites, gabbros, and mylonites. MSZ is a steep-dipping shear zone with dextral kinematics where three sets of deformations were identified.