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The CatWISE2020 Catalog consists of 1,890,715,640 sources over the entire skyselected from WISE and NEOWISE survey data at 3.4 and 4.6 $\mu$m (W1 and W2)collected from 2010 Jan. 7 to 2018 Dec. 13. This dataset adds two years to thatused for the CatWISE Preliminary Catalog (Eisenhardt et al., 2020), bringingthe total to six times as many exposures spanning over sixteen times as large atime baseline as the AllWISE catalog. The other major change from the CatWISEPreliminary Catalog is that the detection list for the CatWISE2020 Catalog wasgenerated using ${\it crowdsource}$ (Schlafly et al. 2019), while the CatWISEPreliminary Catalog used the detection software used for AllWISE. These twofactors result in roughly twice as many sources in the CatWISE2020 Catalog. Thescatter with respect to ${\it Spitzer}$ photometry at faint magnitudes in theCOSMOS field, which is out of the Galactic plane and at low ecliptic latitude(corresponding to lower WISE coverage depth) is similar to that for the CatWISEPreliminary Catalog. The 90% completeness depth for the CatWISE2020 Catalog isat W1=17.7 mag and W2=17.5 mag, 1.7 mag deeper than in the CatWISE PreliminaryCatalog. From comparison to ${\it Gaia}$, CatWISE2020 motions are accurate atthe 20 mas yr$^{-1}$ level for W1$\sim$15 mag sources, and at the $\sim100$ masyr$^{-1}$ level for W1$\sim$17 mag sources. This level of precision representsa 12$\times$ improvement over AllWISE. The CatWISE catalogs are available inthe WISE/NEOWISE Enhanced and Contributed Products area of the NASA/IPACInfrared Science Archive.