The boiling point rise (elevation) of aqueous industrial solutions is often regarded as an important property with respect to chemical process design. This work shows an application of the Pitzer method for calculating the activity coefficients to the estimation of the boiling point rise of single-component and multicomponent electrolyte solutions. Good agreement between experimental and predicted values of the boiling point elevations of solutions of several salts (NaOH, Na2CO3, Na2SO4, NaCl, Na2S2O3, Na2S, mixed NaOH-Na2CO3, and mixed Na2CO3-Na2SO4) was obtained. A method for using the boiling point rise data to obtain ionic interaction parameters for the Pitzer method is also shown.