The ATLAS Collaboration[1] has been preparing for Large Hadron Collider (LHC) running for more than 20 years. By summer of 2007 we expect the first colliding beams of protons and the start of a data deluge involving many Petabytes of data per year. The collaboration is eagerly anticipating the many possible scientific discoveries which may lie hidden in this massive amount of information. I will discuss how the ATLAS collaboration is planning to manage this large amount of data and provide physicists the infrastructure required to: – Calibrate and align detector subsystems to produce well understood data – Realistically simulate the ATLAS detector and underlying physics of interest – Provide access to ATLAS data globally – Define, manage, search and analyze data-sets of interest There are also numerous research activities in networking and grids which could eventually have a significant impact on the ability of ATLAS (and LHC) physicists to quickly access distributed data ...