CERN-LHC. Measurements of the cross section for W+- plus Z0 production in proton proton collisions at a centre-of mass energy of 7 TeV. The data sample used, collected during 2011, has a total integrated luminosity of 4.6 fb-1 with 317 candidate events in the double leptonic decay final state with electrons, muons and missing transverse momentum. The total cross section is presented together with fiducial cross sections in a common phase space region. This fiducial region is defined as: PT of electrons and muons from Z0 decays > 15 GeV PT of electrons and muons from the W+- decays > 20 GeV |pseudorapidity| of muons and electrons < 2.5 PT of neutrinos from W+- decays > 25 GeV |dilepton mass - Z0 mass| < 10 GeV MT of W+- > 20 GeV. Note added (25 JUN 2014): The cross section values reported in Tables 1,2 below should be multiplied by a factor of 1.0141 to take into account the updated value of the integrated luminosity for the ATLAS 2011 data taking period. The uncertainty on the global normalisation ("Lumi") remains at 1.8%. See Eur.Phys.J. C73 (2013) 2518 for more details.