The Theoretical Physics pole gathers theorists working on a large range of fields : cosmology and gravitation, Higgs boson physics, QCD, flavour physics, BSM models and theories, nuclear physics, statistical physics, health physics and mathematical physics. The strength of theoretical physics, characterised by its transverse nature, comes on one side from the collaboration between theorists and experimentalists and on the other side from the interaction among theorists designing and refining common tools to tackle various problems. Many theory activities requires numerical simulations and efficient computing tools to treat and store data, as well as cutting-edge programming and algorithmic approaches.