The standard molar energy of combustion of 1,7,7-trimethylbicyclo[2.2.1]heptan-2-thione (thiocamphor), [53402-10-1], has been determined by using a rotary-bomb calorimeter. The vapour pressure of the compound was measured between the interval T = 261.96 K to T = 281.66 K, by the Knudsen-effusion technique. From the experimental results of this work, the standard molar enthalpies of combustion, sublimation and formation in the crystalline and gaseous state at the temperature of T = 298.15 K have been derived for thiocamphor: Delta(C)H(m)(o) = -(6736.9 +/- 3.3) kJ.mol(-1); Delta(f)H(m)(o)(cr) (86.8 +/- 3.5) kJ.mol(-1); Delta(sub)H(m)(o) = (61.7 +/- 0.9) kJ.mol(-1); and Delta(f)H(m)(o)(g) = -(25.1 +/- 3.6) kJ.mol(-1). These results have been combined with their gas-phase proton affinities to yield the standard enthalpy of formation of the thiocamphor H+ species.