2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/37395I present a small selection of the many QCD studies that have been performed at HERA. I concentrate on results that have been made available in the past year. Results are presented on the QCD description of the parton density functions, determinations of alpha_S, jets and heavy flavour production. Where possible comparisons are made with next to leading order (NLO) QCD predictions. The neutral and charged current cross sections at very high Q^2 are also discussed.20 pages, 17 figures, invited talk given at La Thuile Mar 3-9, 2002 on behalf of the ZEUS and H1 Collaborations, to appear in the proceedingsHigh Energy Physics - Experimenttext