Rate coefficient measurements for the reaction O(P-3) + trichloroethylene have been obtained in two types of high-temperature photochemistry (HTP) reactors. Ground state oxygen atoms were produced by either flash photolysis or laser photolysis of SO2 or O2, and their relative concentrations were monitored by resonance fluorescence. The data are well fitted by k(295-1127 K) = 1.1 x 10-(12) exp(-695 K/T) + 1.5 x 10(-9) exp(-7508 K/T) cm(3) molecule(-1) s(-1), with 2 sigma precision limits varying from +/-3% to +/-12% and 2 sigma accuracy limits of approximate to+/-22%. The rate coefficients are compared to those of O atom reactions with other chloro- and alkyl-substituted ethylenes; a unified semiempirical k(T) estimation method is established for lower temperatures and suggested for higher temperatures. The heat of formation of C2Cl3 is discussed.