SUSY searches at ATLAS

First ATLAS searches for signals of Supersymmetry in proton-proton collisions at the LHC are presented. 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 $35 m{pb}^{-1}$, has been analyzed. The limits on squarks and gluinos are the most stringent to date.