DYFED-Powys Police are concerned for the welfare of Gary Shepherd-Mason, aged 54, who has been reported missing from his home in Carmarthen.
Mr Shepherd-Mason was last seen leaving his home in Russell Terrace on Thursday, November 15 and has not been in touch with friends or family since.
He is 6ft 1in tall, of skinny build, with brown hair which he wears in a ponytail.
He has a tattoo of a bulldog on one arm and an SAS tattoo on the other. He usually has stubble and has a gold stud in his right ear.
He is possibly wearing a black bomber jacket, blue hooded top and blue jeans, and is likely to be wearing a hat.
Anyone with any information about Mr Shepherd-Mason’s whereabouts is asked to contact Dyfed-Powys Police by calling 101, quoting reference 92 of November 16.