An observation of the Higgs boson production for the two photon decay channel with the 2016 LHC \textrm{Run}~2 data is described. The analysis is performed using the dataset recorded by the CMS experiment at the LHC from pp collisions at centre-of-mass energy of 13~\textrm{TeV} corresponding to an integrated luminosity of 12.9~\textrm{fb}^{-1}. The observed significance for the standard model Higgs boson at the Run 1 ATLAS+CMS combined m_{H} = 125.09~\mathrm{GeV} is 5.6~\sigma, where 6.2~\sigma is expected. A maximum significance of 6.1~\sigma is observed at 126.0~\mathrm{GeV}. The best-fit signal strength relative to the standard model prediction is 0.95 \pm 0.20 = 0.95 \pm 0.17 \text{~(stat.)~}^{+0.10}_{-0.07} \text{~(syst.)~}^{+0.08}_{-0.05} \text{~(theo.)} when the mass parameter is profiled in the fit, and 0.91 \pm 0.20 = 0.91 \pm 0.17 \text{~(stat.)~} ^{+0.09}_{-0.07} \text{~(syst.)~} ^{+0.08}_{-0.05} \text{~(theo.)} when it is fixed to m_{H} = 125.09~\mathrm{GeV}. The fiducial cross section is measured to be \hat{\sigma}_{fid} = 69^{+18}_{-22}~\text{fb} = 69^{+16}_{-22} (\text{stat.})^{+8}_{-6} (\text{syst.})~\text{fb}, where the standard model theoretical prediction is 73.8 \pm 3.8~\mathrm{fb}.

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