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We present griz light curves of 251 Type Ia Supernovae (SNe Ia) from thefirst 3 years of the Dark Energy Survey Supernova Program's (DES-SN)spectroscopically classified sample. The photometric pipeline described in thispaper produces the calibrated fluxes and associated uncertainties used in thecosmological parameter analysis (Brout et al. 2018-SYS, DES Collaboration etal. 2018) by employing a scene modeling approach that simultaneously forwardmodels a variable transient flux and temporally constant host galaxy. We injectartificial point sources onto DECam images to test the accuracy of ourphotometric method. Upon comparison of input and measured artificial supernovafluxes, we find flux biases peak at 3 mmag. We require corrections to ourphotometric uncertainties as a function of host galaxy surface brightness atthe transient location, similar to that seen by the DES Difference ImagingPipeline used to discover transients. The public release of the light curvescan be found at https://des.ncsa.illinois.edu/releases/sn.

First Cosmology Results Using Type Ia Supernovae From the Dark Energy Survey: Photometric Pipeline and Light Curve Data Release