  AIMS: Search for star formation regions in the hosts of potentially young
radio galaxies (Gigahertz Peaked Spectrum and Compact Steep Spectrum sources).
METHODS: Near-UV imaging with the Hubble Space Telescope Advanced Camera for
Surveys.} RESULTS: We find near-UV light which could be the product of recent
star formation in eight of the nine observed sources, though other explanations
are not currently ruled out. The UV luminosities of the GPS and CSS sources are
similar to those of a sample of nearby large scale radio galaxies. Stellar
population synthesis models are consistent with a burst of recent star
formation occuring before the formation of the radio source. However,
observations at other wavelengths and colors are needed to definitively
establish the nature of the observed UV light. In the CSS sources 1443+77 and
1814-637 the near-UV light is aligned with and is co-spatial with the radio
source. We suggest that in these sources the UV light is produced by star
formation triggered and/or enhanced by the radio source.
