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A semi‐empirical equation has been established to calculate very accurately the ideal‐gas heat capacity cp0 of molecular oxygen in the temperature range from 30 K to 3000 K. The new equation contains special terms derived from statistical‐thermodynamic considerations in order to represent that part of cp0 resulting from the vibration energy of the molecule and the energy of electronic excitation. The cp0‐values calculated with the new equation have been compared with values directly calculated by evaluation of the partition functions for fixed temperatures listed in known tabulations. Because of the “physical” background of the equation extrapolations beyond 3000 K are possible. Corresponding expressions for the ideal‐gas enthalpy and entropy of oxygen are also given.