The paper reviews the major engineering components of magnetic confinement devices, i.e. the magnet systems, the vacuum system, fuelling systems, components for heat removal and particle exhaust, and heating and current drive systems. Most technological developments have been achieved for tokamak systems, and the main focus is now on the ITER design actitivities. In addition, some information is given on stellarators and reversed field pinches. The field to be reviewed is very large so that it was not possible to give a comprehensive review. Reference is made to other review papers in the different areas and only specific examples are given for solutions representing the current state of technology.