Gardaí in Dundrum are appealing for the public's help in tracing the whereabouts of Stephen Pidgeon (27) who has been missing since 2pm on Friday.
He is described as being 1.8m tall with dark brown hair and when last seen he was wearing a grey Liverpool coat, navy tracksuit bottoms with red and white stripes, cream runners a royal blue top and white t-shirt.
Gardaí say Stephen is autistic.
There is a possibility that Stephen may have used his bus pass to travel to shopping centres in the Dublin area.
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Anyone who may have seen him is asked to contact the Gardaí in Dundrum on 6665600.