Grigory Efimovich Volovik (; born 7 September 1946 in Moscow) is a Russian theoretical physicist. He is known for his work on solid-state physics and astroparticle physics. His series work in 1970s-2000s about semi metal and topologically protected spinor/femionic excitations in topological defects and boundary are paid enormous amount attentions in recent decade years because the discoveries about the topological solid state materials and potentially technical application on quantum computation. He also contributes a lot on emergent quantum field theory and gravity theory, one idea is phenomenological Q theory of cosmological constant problem.