We report the kinematic viscosities of aqueous solutions of ferric sulfate containing sodium nitrate, potassium nitrate, sodium bromide, or potassium bromide at concentrations of up to 1 mol L-1 (or up to the solubility limit) and at temperatures ranging from 293.1 to 323.1 K. Concentrations of NaNO3 or NaBr altered the viscosities of the unsupplemented Fe-2(SO4)(3) solutions by no more than 3%. For each concentration of Fe-2(SO4)(3) employed, the measured viscosities of solutions with KNO3 or KBr were fitted to within 0.9% by semiempirical equations. For each solution studied, its density at 298.1 K is also reported.