Gwent Police is appealing for information to trace missing 34 year old Marcus Williams.
Marcus was reported missing from his home address in Bargoed on Monday 17th January.
He is described as being white, of slim build, 6 feet 2 inches tall with short brown hair.
It is believed that Marcus may be in the Merthyr area where he has links.
Police are concerned about the welfare of Marcus because this is the first time he has been reported missing and is out of character for him.
Marcus, or anyone with information about his whereabouts is asked to contact Gwent Police on 01633 838111.
