The temperature dependences of nonradiative decay for the metal-to-ligand charge transfer excited states of [Re(bpy)(Co)(3)(4-Etpy)](PF6) and [Os(bpy)(2)(CO)(Py)(PF6)(2) (bpy = 2,2’-bipyridine; 4-Etpy 4-ethylpyridine; py pyridine) follow the behavior predicted by the energy gap law. The variations with temperature can be calculated to within a factor of 2-3 by using parameters derived from a Frank-Condon analysis of emission spectral profiles.