Neutron diagnostics for magnetically confined plasmas deal with measurements from a source with temporal and spatial dimension of seconds and meters where the resolution requirements are typically of the order 10-3s and 10-3.a m in, e.g., tokamaks where a is the poloidal minor radius. The main information is derived from data on the total yield rate, the poloidal brightness distribution and the energy distribution of the neutron emission as measured with calibrated neutron flux monitors, collimator arrays (cameras) and spectrometers. The yield diagnostics are routinely on all neutron producing plasma experiments while cameras have been used at JET and TFTR only. Neutron spectrometry has been used from the very beginning of fusion research and this diagnostic has since seen a continuos development with the ever increasing fusion power of the plasmas.