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We model an apparent gravitational lens system HDFS 2232509-603243 in theHubble Deep Field South. The system consists of a blue V=25 mag arc separatedby 0.9 arcsec from a red V=22 mag elliptical galaxy. A mass distribution whichfollows the observed light distribution with a constant mass-to-light ratio canfit the arc component positions if external shear is added. A good fit is alsoobtained with simple parameterized models, and all the models predict a forthimage fainter than the detection limit. The inferred mass-to-light ratio isroughly 15 in solar units if the lens is at redshift 0.6. The lens modelspredict a velocity dispersion of about 280 km/s which could be confirmed withspectroscopy.Comment: 12 pages, 3 PostScript figures, accepted by ApJL. Revised to account  for the referee's report, also some rewritin

A Possible Gravitational Lens in the Hubble Deep Field South