Future colliders

Future high-energy colliders are discussed, in particular linear e(+)e(-)colliders, mu(+)mu(-) colliders and hadron colliders. The energies of the e(+)e(-)colliders are larger than that of the existing e(+)e(-)collider LEP The energies of the very large hadron colliders are larger than that of the LHC being constructed at CERN. Two mu(+)mu(-) colliders at 100 and 3000 GeV are included. For all these colliders, parameter lists, topics of R&D, and progress with component tests are discussed.