  We study properties of static, asymptotically AdS black holes in Lovelock
gravity. Our main result is a Smarr formula that gives the mass in terms of
geometrical quantities together with the parameters of the Lovelock theory. As
in Einstein gravity, the Smarr formula follows from applying the first law to
an infinitesimal change in the overall length scale. However, because the
Lovelock couplings are dimensionful, we must first prove an extension of the
first law that includes their variations. Key ingredients in this construction
are the Killing-Lovelock potentials associated with each of the the higher
curvature Lovelock interactions. Geometric expressions are obtained for the new
thermodynamic potentials conjugate to variation of the Lovelock couplings.
