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∞ ) (3.3 ( 0.3) × 10-12 cm3 molecule -1 s-1. The results are discussed with respect to the available literature for reactions of Cl atoms with halogenated organic compounds and the potential role of the title reaction in atmospheric chemistry.