An analysis is presented of the thermodynamic properties of D2O in the critical region. It is shown that the data can be represented by the same revised and extended scaled fundamental equation formulated earlier for the thermodynamic properties of H2O in critical region. The equation is valid in the range 220–465 kg/m3in density and 638–683 K in temperature. Tabulated values of the thermodynamic properties of D2O in the critical region are presented. A comparison with a comprehensive analytic fundamental equation, recently formulated by Hill and co‐workers, is included in the paper.