Flavour physics and lattice QCD: averages of lattice inputs for the Unitarity Triangle Analysis

We review the recent results of lattice QCD calculations relevant for flavour physics. We discuss in particular the hadronic parameters entering the amplitudes of K0 - K→0, D0 - D→0 and B0 - B→0 mixing, the B- and D-meson decay constants and the form factors controlling B-meson semileptonic decays. On the basis of these lattice results, which are extensively collected in the paper, we also derive our averages of the relevant hadronic parameters.