The results of the published work on the high pressure‐high temperature properties of the AB‐type compounds have been compiled and evaluated. All pressure studies above the range of 1 kilobar have been included with an emphasis on the accurate characterization of the solid‐solid phase boundaries and the experimental melting curves. Whenever x‐ray diffraction data are available for the high pressure phases, they have also been reviewed. Phase diagrams are included for all compounds in which measurement of more than one point along the phase boundary was made. This review discusses a total of 87 compounds and 212 distinct high pressure‐high temperature phases.