The metabolism of styrene oxide has been studied in the rat and guinea pig, with emphasis upon bivalent sulfur metabolites. Methylthio analogs of phenylethylene glycol, with the methylthio group in both possible positions, were found as urinary metabolites in both species. These compounds were present in more than trace amounts. The excretion of 2-hydroxy-1-methylthio-1-phenylethane amounted to about 7% of the administered dose in the guinea pig, and about 2% in the rat, in o-24 hr urine samples. The positional isomer 1-hydroxy-2-methylthio-1-phenylethane was excreted in lesser amounts in both species. Acidic urinary metabolites derived from glutathione conjugates are species dependent. In this study, the only products observed in the rat were the mercapturic acids expected as a result of reaction of the oxide with glutathione. In the guinea pig, the major bivalent sulfur acids were the corresponding mercaptoacetic acids. Other related metabolites included a mercaptolactic and a mercaptopyruvic acid, together with one of the mercapturic acids. These metabolites result from partial acetylation or acetylation/deacetylation of cysteine or cysteinylglycine adducts. The hitherto unobserved dihydrodiol formed via an arene oxide was found as a minor metabolite for both styrene and styrene oxide.