The title reaction was studied using two different experimental techniques: laser flash photolysis with resonance fluorescence detection of Cl atoms and continuous photolysis with FTIR detection of end products. Over the temperature range 206−432 K the rate constant for reaction of Cl atoms with CH2ICl is given (to within ±15%) by the Arrhenius expression k1 = 4.4 × 10-11 exp(195/T) cm3 molecule-1 s-1, which gives k1 = 8.5 × 10-11 cm3 molecule-1 s-1 at 298 K. Variation of the total pressure of N2 diluent over the range 5−700 Torr at 295 K had no discernible (<10%) effect on the rate of reaction. At 295 K in 100−700 Torr of N2 the reaction proceeds via iodine transfer to give CH2Cl radicals. As part of this work the rate constant k(CH2Cl+O2+M) was measured at 295 K in the presence of 1−800 Torr of N2 diluent. The results were well described by the Troe expression with a broadening factor Fc of 0.6 and limiting low- and high-pressure rate constants of k0 = (1.8 ± 0.1) × 10-30 cm6 molecule-2 s-1 and k∞ = (3...