The heat capacities of I-adamantanol and 2-adamantanol in the condensed state were measured in a vacuum adiabatic calorimeter between (5 and 305) K and in a scanning calorimeter of the heat bridge type between (300 and 600) K. It was found that I-adamantanol formed two different crystalline phases, and 2-adamantanol formed four different crystalline phases. The thermodynamic characteristics of the solid-to-solid phase transitions and fusion were obtained. The thermal functions of the studied compounds in the crystalline and liquid state were obtained. The high-temperature crystalline phases (crI) of both compounds had cubic face-centered lattices that followed from X-ray diffraction data. The lattice parameters were calculated.