$B$ Hadron Physics at the Tevatron*

The $b$ quark is the most massive quark that forms bound hadronic states and the study of hadrons containing $b$ quarks provides deep insight into many facets of the Standard Model: the structure of flavor dynamics, QCD, and weak decays, including CP violation. The physics and properties of $b$ hadrons as measured by the Tevatron experiments CDF and D\O\ are reviewed. Particular emphasis is placed on the more massive $b$ hadron states not accessible at $B$ factories running at the $\Upsilon(4S)$. Data sets in excess of 3~fb$^{-1}$ allow increased precision for detailed studies of $b$ hadron production, spectroscopy, lifetimes, neutral $B$ meson oscillations, and CP violation. Studies of rare decays as well as these precision measurements also open a window on to possible new physics beyond the Standard Model.