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We describe the Dark Energy Survey (DES) photometric data set assembled fromthe first three years of science operations to support DES Year 3 cosmologyanalyses, and provide usage notes aimed at the broad astrophysics community. Y3Gold improves on previous releases from DES, Y1 Gold and Data Release 1 (DESDR1), presenting an expanded and curated data set that incorporates algorithmicdevelopments in image detrending and processing, photometric calibration, andobject classification. Y3 Gold comprises nearly 5000 square degrees of grizYimaging in the south Galactic cap, including nearly 390 million objects, withdepth reaching S/N ~ 10 for extended objects up to $i_{AB}\sim 23.0$, andtop-of-the-atmosphere photometric uniformity $< 3$ mmag. Compared to DR1,photometric residuals with respect to Gaia are reduced by $50\%$, andper-object chromatic corrections are introduced. Y3 Gold augments DES DR1 withsimultaneous fits to multi-epoch photometry for more robust galaxy colormeasurements and corresponding photometric redshift estimates. Y3 Gold featuresimproved morphological star-galaxy classification with efficiency $>98\%$ andpurity $>99\%$ for galaxies with $19 < i_{AB} < 22.5$. Additionally, itincludes per-object quality information, and accompanying maps of the footprintcoverage, masked regions, imaging depth, survey conditions, and astrophysicalforegrounds that are used to select the cosmology analysis samples. This paperwill be complemented by online resources.

Dark Energy Survey Year 3 Results: Photometric Data Set for Cosmology