The temperatures and enthalpies of phase transitions as well as the heat capacity of solid and liquid PrBr3, K3PrBr6, Rb3PrBr6, and Cs3PrBr6 were measured by differential scanning calorimetry in the temperature range from 400 K up to 1100 K. A linear heat capacity dependence on temperature was used to fit the experimental data. Through a combination of these experimental results with the entropy at 298.15 K, the thermodynamic functions of PrBr3 and M3PrBr6 compounds were calculated up to T = 1100 K.