Specific heats of aqueous solutions of various alkali halides (LiCl, KC1, KF, CsCl, and Csl) and alkylammonium salts (CH3NH3CI, C2H5NH3CI, and ÍM-C4H9) 4NBr) have been measured in the temperature range of 30-130°with an adiabatic calorimeter. The apparent molal heat capacities *CP evaluated from the heat capacity data are negative in the case of the investigated alkali halides and positive in the case of the alkylammonium salts.The temperature dependence of reveals a maximum at about 50-90°for all cases except (W-C4H9) 4NBr. Approximate values for the partial molal heat capacities CP2°c an be obtained by extrapolation of to infinite dilution. The influence of the dissolved salts on the solvent structure and the contribution of the solventsolute interaction to the partial molal heat capacities are discussed.