The Dischmabach is a river of approximately 15 km long in the river system of Albula. It drains the Dischma valley, its catchment area lies mainly in the area of the Swiss municipality of Davos.
Within the Posterior Rhine system, the sources of Dischmabach are about 72 km from the confluence of the Anterior and Posterior Rhine. Only the headwaters Rein da Medel, Rein da Maighels and Rein da Curnera in the Vorderrhein system are further away from this confluence (about 74–76 km). Thus the Dischmabach is, in terms of length, one of the most important headwaters of the Rhine (see also sources of the Rhine).