Search for Dark Matter Candidate with the ATLAS detector

Supersymmetry is one of the more appealing theory beyond the Standard Model, and provides a natural Dark matter candidate. First ATLAS searches for signals of Supersymmetry in proton-proton collisions at the LHC will be reported. These searches are performed in various channels containing different lepton and jet multiplicities in the final states; the full data sample recorded in the 2010 LHC run, corresponding to an integrated luminosity of 35 pb-1, has been analysed.