Abstract The recent discovery of native sulfur (‘sulfur stones’ consist of elemental sulfur) by Curiosity rover in the Gale Crater has sparked considerable research interest toward identifying its formation mechanisms that could generate novel insights into Martian sulfur cycling. This study examines aqueous, abiotic oxidation of sulfide by chlorate (ClO3−) as a plausible pathway for native sulfur production on Early Mars. A series of controlled anaerobic batch experiments were performed under acidic conditions (pH ∼ 1.7) and ambient temperature (22°C) across a range of dissolved chlorate concentrations (0–50 mM) for a 54‐day duration. Spectroscopic analyses (XRD, Raman, SEM‐EDS) of precipitates formed from experiments and observed changes in fluid chemistry confirmed the formation of elemental sulfur and sulfate. Our findings provide the first successful demonstration of elemental sulfur formation via abiotic chlorate‐driven homogeneous oxidation of aqueous sulfide and highlight the potential for coupled S‐Cl cycling as important drivers of redox transformation on Mars.