This will be the 37th meeting in this series of annual international multidisciplinary meetings, created in 1989 by Jean Trân Than Vân and which has in the past covered many topics in physics, astronomy and biology. All sessions take place in the Château of Blois, a beautiful renaissance castle which has housed many French kings, and notably François 1st. The 37th Rencontres de Blois on "Particle Physics and Cosmology" (Blois2026) will emphasize the increasing interplay between high energy accelerator based physics and cosmology. The conference will consist of plenary sessions for invited in