  We present a model of radiative neutrino mass that automatically contains an
accidental $Z_2$ symmetry and thus provides a stable dark matter candidate.
This allows a common framework for the origin of neutrino mass and dark matter
without invoking any symmetries beyond those of the Standard Model. The model
can be probed by direct-detection experiments and $\mu\rightarrow e+\gamma$
searches, and predicts a charged scalar that can appear at the TeV scale,
within reach of collider experiments.
