The aim of this study was to evaluate the effects of using different concentrations of sodium bisulfite (0, 0.2, 0.4, 0.6, 0.8,1.0%) during the soaking step of rice parboiling on thiamine and sulfite content, as well as to examine important technological properties of parboiled rice such as broken grains and stained grains percentage, whiteness, cooking time, hardness, and percentage of completely gelatinized and non-gelatinized grains. In addition, the pasting properties of parboiled rice were determined.