Two forms of lead iodate, with different crystalline structures and solubilities in water, have been reported. Previous workers have found that when the compound is prepared from dilute solution with a slight excess of lead nitrate one form is produced at 25 degreesC and the other at 60 degreesC. In this study, relative excesses of lead nitrate or potassium iodate during precipitation were found to have more influence than temperature on the form produced. Solubilities in water at various temperatures and in several aqueous systems at room temperature have been determined. Photomicrographs and X-ray data have also been obtained.