[RuCl2(p-cymene)](2) has been immobilized on silica and mesoporous MCM-41 and used as a catalyst for the atom transfer radical polymerisation (ATRP) of styrene, (methyl)mcthacrylate and acrylonitrile. The heterogeneous catalyst has a comparable activity as the homogeneous analogues and showed no significant loss of catalytic activity when reused.