Abstract Application of the laser photolysis–laser-induced fluorescence method to the reaction NH₂ + SO₂ in argon bath gas yields pressure-dependent, third-order kinetics which may be summarized as k = (1.49 ± 0.15) × 10⁻³¹ (T/298 K)^−0.83 cm⁶ molecule ^–2 s ^–1 over 292–555 K, where the uncertainty is the 95% confidence interval and includes possible systematic errors. The quenching of vibrationally excited NH₂ is consistent with a high-pressure limit for NH₂ + SO₂ of (1.62 ± 0.25) × 10⁻¹¹ cm³ molecule ^–1 s ^–1 over the temperature range 295–505 K, where again the 95% confidence interval is shown. Ab initio analysis yields a H₂N–SO₂ dissociation enthalpy of 73.5 kJ mol ^–1, and comparison with RRKM theory and the exponential down model for energy transfer yields 〈ΔE〉_down = 350 cm ^–1 for Ar at room temperature.