The electrosurface characteristics of titanium oxide nanoparticles synthesized by the sol–gel method are studied in relation to the pH and concentration of solutions of sodium, potassium, barium, and lanthanum chlorides. The surface charges and electrokinetic potentials are found, and the positions of the points of zero charge are analyzed as depending on the type and concentration of cations. The absence of a negative region of the electrokinetic potential, which results from the superequivalent adsorption in the Stern layer, is revealed for BaCl2 and LaCl3 solutions.