The technique of solid titrant titrimetry has been described and its advantages enumerated. Precision and time required have been determined to be comparable with those of conventional titrimetry. Investigations with solid titrants have been made of the photometric titrations of Cu with EDTA, Fe(II) with KMnO4, As(III) with KMnO4, and Fe(III) with ascorbic acid. The technique has also been used in the visual titration of Fe(III) with ascorbic acid and Fe(II) with KMnO4.