  As an introduction to QCD at the LHC I give an overview of QCD at the
Tevatron, emphasizing the high Q^2 frontier which will be taken over by the
LHC. After describing briefly the LHC detectors I discuss high mass
diffraction, in particular central exclusive production of Higgs and vector
boson pairs. I introduce the FP420 project to measure the scattered protons
420m downstream of ATLAS and CMS.
