Dissociative electron attachment to CCl 3 Br has been studied using a flowing afterglow/Langmuir probe (FALP) and a crossed beam technique. In the FALP experiment the overall attachment rate coefficients and the branching ratio into the Cl - and the Br - product channels, R = Cl - /(Cl - + Br - ), were measured as a function of the gas temperature, T g , in the range of 300-540K and the electron temperatures, T e , from T g to 4000K indicating that R approached the statistical value of 0.75 at the highest T g . At T g = 540K both Cl - 2 and ClBr - molecular ions were observed at about the 2% level. An apparent activation energy of 55 meV for the overall attachment reaction was derived using a model developed previously to describe the dependence of dissociative electron attachment rates on T g and T e . The crossed beam experiment provided relative attachment cross-sections for the production of Cl - and Br - as a function of electron energy, E, from near zero up to 2 eV at several T g within the range 311-423 K. The absolute cross-sections at T g = 311K were obtained from the FALP value using a calibration procedure. At low E the overall attachment cross-section varies as E - 1 in accordance with s-wave capture theory. In accordance with the FALP data R increases from 0.2 at low E and the lowest T g to the statistical value of 0.75 at high E and high T g . A peak observed in the cross-section at an E of about 0.7 eV is tentatively attributed to p-wave electron attachment. The rapid decrease of this peak cross-section with T g is ascribed to autodetachment.