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We present clustering redshift measurements for Dark Energy Survey (DES) lenssample galaxies to be used in weak gravitational lensing and galaxy clusteringstudies. To perform this measurement, we cross-correlate with spectroscopicgalaxies from the Baryon Acoustic Oscillation Survey (BOSS) and its extension,eBOSS. We validate our methodology in simulations, including a new technique tocalibrate systematic errors due to the galaxy clustering bias, finding ourmethod to be generally unbiased in calibrating the mean redshift. We apply ourmethod to the data, and estimate the redshift distribution for eleven differentphotometrically-selected bins. We find general agreement between clusteringredshift and photometric redshift estimates, with differences on the inferredmean redshift to be below $|\Delta z|=0.01$ in most of the bins. We also test amethod to calibrate a width parameter for redshift distributions, which wefound necessary to use for some of our samples. Our typical uncertainties onthe mean redshift ranged from 0.003 to 0.008, while our uncertainties on thewidth ranged from 4 to 9\%. We discuss how these results calibrate thephotometric redshift distributions used in companion DES Year 3 Results papers.

Dark Energy Survey Year 3 Results: Calibration of Lens Sample Redshift Distributions using Clustering Redshifts with BOSS/eBOSS