A search for the Standard Model Higgs boson in proton-proton collisions with the ATLAS detector at the LHC is presented. The datasets used correspond to integrated luminosities of approximately 4.8 fb$^{-1}$ collected at $\sqrt{s}$ = 7 TeV in 2011 and 5.8 fb$^{-1}$ at $\sqrt{s}$ = 8 TeV in 2012. Individual searches in the channels $H \to ZZ^{(*)} \to llll, H \to \gamma \gamma$ and $H \to WW^{(*)} \to e\nu\mu\nu$ in the 8 TeV data are combined with previously published results of searches for $H \to ZZ^{(*)}, WW^{(*)}, b\bar{b}$ and $\tau^+ \tau^-$ in the 7 TeV data and results from improved analyses of the $H \to ZZ^{(*)} \to llll$ and $H \to \gamma\gamma$ channels in the 7 TeV data. Clear evidence for the production of a neutral boson with a measured mass of 126.0 $\pm$ 0.4(stat) $\pm$ 0.4(sys) GeV is presented. This observation, which has a significance of 5.9 standard deviations, corresponding to a background fluctuation probability of 1.7x10$^{-9}$, is compatible with the production and decay of the Standard Model Higgs boson.

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