Thermodynamic data on the halides were reviewed, evaluated, and compiled at the Bureau of Mines Albany Research Center. The values for heat capacities, high-temperature relative enthalpies, enthalpies of formation, and Gibbs energies of formation are given in both tabular and equation forms. The tables include entropy, Gibbs energy functions, and logarithms (base 10) of the equilibrium constants. Where possible, all phases of a halide are presented in a single table. Temperatures of transformation and thermodynamic properties at these temperatures are included in the table. Immediately below the table the natures of transformations are given along with their associated enthalpies.