New experimental rate coefficients are reported for the H 2(D2) + CN→H(D)CN + H(D) reactions over the temperature range 209 to 740 K for H2 and 250 to 740 K for D 2. Previous reduced dimensionality reaction probabilities for the reaction with H2, and new ones for the reaction with D2 are used to obtain analogous rate coefficients. In addition, reaction probabilities and rate coefficients for vibrationally excited reactants H 2 (v = 1), D2 (v = 1), or CN(v = 1) are presented. Comparisons of the calculated rate coefficients are made with the new and previous experiments, especially those of Sims and Smith [Chem. Phys. Lett. 149, 565 (1988)].