2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/45712The status of lattice calculations for heavy quark systems is reviewed, focussing on weak matrix elements for leptonic and semi-leptonic decays of heavy mesons. After an assessment of the main systematic errors, results for the decay constants $f_D$ and $f_B$, the $B$ parameter describing $B - \bar{B}$ mixing, the Isgur-Wise function and the spectroscopy of heavy baryons are discussed.7 pages, uuencoded, compressed postscript file. Plenary talk given at "Hadron 95", Manchester, July 9-14, to appear in the proceedingsHigh Energy Physics - PhenomenologyHigh Energy Physics - Latticetext