The Institut Lagrange de Paris (ILP) unites research groups from the Sorbonne Université and CNRS, mainly from the Institut d'Astrophysique de Paris (IAP), the Laboratoire de Physique Nucléaire et Hautes Energies (LPNHE), and the Laboratoire de Physique théorique et Hautes Energies (LPTHE). Established in 2011, the ILP contains internationally recognised research programs in theoretical and observational cosmology, (astro-) particle physics, and theoretical and experimental high energy physics. The ILP's mission is to advance foundational questions on the origin, constituents, dynamics, and fate of the Universe.