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The kinetics of sulfur-utilized autotrophic denitrification of groundwater was evaluated in batch tests to obtain kinetic parameters. Experiments were performed in media bottles containing varying NO₃ ⁻-N concentrations (20, 44, and 77 mg/L) with 4.0–4.75 mm-sized sulfur particles. Alkalinity was set as a constant in all experimental containers at 850 mg/L as CaCO₃. The half-order kinetic model was found to adequately describe the process efficiently, yielding denitrification rate constants of 4.36, 5.51, and 6.91 mg-N^1/2/L^1/2 · h in the presence of NO₃ ⁻-N at 20, 44, and 77 mg/L, respectively. The rate of denitrification increased with the increasing initial NO₃ ⁻-N concentrations.