Brian Alan Farrell, who is from Culleens in county Sligo, had been working as a carpenter in the Swedish capital since March, according to the Irish Independent newspaper.
It is understood that he was last seen on Monday in Sweden's Gamla Stan (old town).
— Independent.ie (@Independent_ie) November 13, 2014
His brother Michael Farrell is expected in Stockholm on Friday to join efforts to find him.
He told the Irish Independent that his family were “beyond worried” about the disappearance.
Brian Alan Farrell is the third youngest of six boys. One of his brothers died while working on a building site in London seven years ago, the Irish Independent said.