  The Large Hadron Collider LHC is a top quark factory: due to its high design
luminosity, LHC will produce about 200 millions of top quarks per year of
operation. The large amount of data will allow to study with great precision
the properties of the top quark, most notably cross-section, mass and spin. The
Top Physics Working Group has been set up at the ATLAS experiment, to evaluate
the precision reach of physics measurements in the top sector, and to study the
systematic effects of the ATLAS detector on such measurements. This reports
give an overview of the main activities of the ATLAS Top Physics Working Group
in 2004.
