  We present preliminary results from imaging three HST/WFPC2 fields in V and I
within the Chandra Deep Field South (CDFS). HST's sensitivity and resolution
are sufficient to reveal optical counterparts for 24 of the 26 CDFS X-ray
sources detected in the 300 ksec X-ray catalog and to determine the
morphologies of most of these. We find that the X-ray sources comprise two
apparently distinct populations of optical candidates: one optically faint (I >
24) with V - I colors consistent with the I > 24 field population; the other
significantly brighter (I < 22) with colors redder than the I < 22 field
population. More than 2/3 of the X-ray source counterparts are resolved
galaxies. The brighter sources are mostly AGN, based on their high X-ray
luminosity. The optically resolved sources in the brighter population have a
very narrow range of V - I color and appear to be a mix of both late and early
type morphologies at low to moderate redshift. We show that the second
population, with fainter optical counterparts, can be explained as higher
redshift Type 2 AGN.
