R&D on particle accelerators dedicated to high energy physics applications are reviewed. Progress in particle colliders follows two different paths, one aiming at increasing the available energy in collision, the other at increasing the luminosity. Present collider performances and their plans on both fronts for the next future are described, together with the ideas and the technologies being developed for the projects that will be built after LHC. Neutrino beam facilities and plans for plasma wakefield accelerators are mentioned.