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We present weak lensing mass reconstructions for the 20 high-redshiftclusters i n the ESO Distant Cluster Survey. The weak lensing analysis wasperformed on deep, 3-color optical images taken with VLT/FORS2, using acomposite galaxy catalog with separate shape estimators measured in eachpassband. We find that the EDisCS sample is composed primarily of clusters thatare less massive than t hose in current X-ray selected samples at similarredshifts, but that all of the fields are likely to contain massive clustersrather than superpositions of low mass groups. We find that 7 of the 20 fieldshave additional massive structures which are not associated with the clustersand which can affect the weak lensing mass determination. We compare the massmeasurements of the remaining 13 clusters with luminosity measurements fromcluster galaxies selected using photometric redshifts and find evidence of adependence of the cluster mass-to-light ratio with redshift. Finally wedetermine the noise level in the shear measurements for the fields as afunction of exposure time and seeing and demonstrate that future ground-basedsurveys which plan to perform deep optical imaging for use in weak lensingmeasurements must achieve point-spread functions smaller than a median of 0.6"FWHM.

Weak lensing mass reconstructions of the ESO Distant Cluster Survey