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Twenty years have passed since first light for the Sloan Digital Sky Survey(SDSS). Here, we release data taken by the fourth phase of SDSS (SDSS-IV)across its first three years of operation (July 2014-July 2017). This is thethird data release for SDSS-IV, and the fifteenth from SDSS (Data ReleaseFifteen; DR15). New data come from MaNGA - we release 4824 datacubes, as wellas the first stellar spectra in the MaNGA Stellar Library (MaStar), the firstset of survey-supported analysis products (e.g. stellar and gas kinematics,emission line, and other maps) from the MaNGA Data Analysis Pipeline (DAP), anda new data visualisation and access tool we call "Marvin". The next datarelease, DR16, will include new data from both APOGEE-2 and eBOSS; thosesurveys release no new data here, but we document updates and corrections totheir data processing pipelines. The release is cumulative; it also includesthe most recent reductions and calibrations of all data taken by SDSS sincefirst light. In this paper we describe the location and format of the data andtools and cite technical references describing how it was obtained andprocessed. The SDSS website (www.sdss.org) has also been updated, providinglinks to data downloads, tutorials and examples of data use. While SDSS-IV willcontinue to collect astronomical data until 2020, and will be followed bySDSS-V (2020-2025), we end this paper by describing plans to ensure thesustainability of the SDSS data archive for many years beyond the collection ofdata.

The Fifteenth Data Release of the Sloan Digital Sky Surveys: First Release of MaNGA Derived Quantities, Data Visualization Tools and Stellar Library