Aims: Mitochondrion is considered as the major source of intracellular reactive oxygen species (ROS). H 2 S has been reported to be an antioxidant, but its mechanism remains largely elusive. P66Shc is an upstream activator of mitochondrial redox signaling. The aim of this study was to explore whether the antioxidant effect of H 2 S is mediated by p66Shc. Results: Application of exogenous H 2 S with its donor, NaHS, or overexpression of its generating enzyme, cystathionine b-synthase, induced sulfhydration of p66Shc, but inhibited its phosphorylation caused by H 2 O 2 /D-galactose in SH-SY5Y cells or in the mice cortex. H 2 S also decreased mitochondrial ROS production and protected neuronal cells against stress-induced senescence. PKC bII and PP2A are the two key proteins to regulate p66Shc phosphorylation. Although H 2 S failed to affect the activities of these two proteins, it disrupted their association. Cysteine-59 resides in proximity to serine-36, the phosphorylation site of p66Shc. The C59S mutant attenuated the above-described biological function of H 2 S. Innovation: We revealed a novel mechanism for the antioxidant effect of H 2 S and its role in oxidative stress-related diseases. Conclusion: H 2 S inhibits mitochondrial ROS production via the sulfhydration of Cys-59 residue, which in turn, prevents the phosphorylation of p66Shc. Antioxid. Redox Signal. 21, 2531-2542.