Neutron imaging is a radiography technique that makes maximum use of the excellent penetrating power of neutrons, a method that represents neutrons transmitted through a substance as a positional distribution in a projection. A major difference from the preceding chapters, which were set in reciprocal space, is that neutron imaging is concerned with real space. In this chapter, we will begin with the principles of neutron imaging, and then describe methods such as total cross-sectional contrast imaging, energy-resolved imaging, and magnetic field contrast imaging. Furthermore, we will explain neutron tomography, which reconstructs the neutron transmittance of a material in three dimensions, and the Radon transform, which provides its theoretical basis.