DYFED-Powys Police are investigating an allegation of assault which occurred at Pembroke Castle at approximately 9.30pm on Friday 21st June 2019.
One male was taken to hospital for treatment and has since been released.
Officers would like to speak to the man in the CCTV image, as he may have information that could help the investigation.
If this is you or if you know this person police would like to hear from you.
Anyone who witnessed the incident or anyone with information which could help the investigation is asked to contact police on 101 or Crimestoppers anonymously on 0800 555 111.