The heat capacities of protonated layered perovskite-like oxides H_1.64K_0.36Nd₂Ti₃O₁₀·0.61 H₂O and H_1.89K_0.11Nd₂Ti₃O₁₀·0.60 H₂O were measured by precision adiabatic vacuum calorimetry over the temperature range of (6–300) K. The standard thermodynamic functions: molar heat capacity, enthalpy, entropy, and the Gibbs energy of the compounds were evaluated from the experimental data of the heat capacities over the temperature range of T = (6–300) K. The deviation of experimental points from fitting curves obtained on the basis of Debye's theory. The overview on low-temperature heat capacity and standard thermodynamic properties of cation-ordered layered perovskite-like titanates NaLnTiO₄ and A₂Ln₂Ti₃O₁₀ (A=H, Na, K; Ln=La, Nd, Gd) is present.