Marco Lenci, Luc Rey-Bellet Large deviations in quantum lattice systems: one-phase region (77K, LaTeX 2e) ABSTRACT. We give large deviation upper bounds, and discuss lower bounds, for the Gibbs-KMS state of a system of quantum spins or an interacting Fermi gas on the lattice. We cover general interactions and general observables, both in the high temperature regime and in dimension one.