Wiltshire Police are appealing for the help in locating a missing father and son from Chippenham.
Geoffrey Tomlinson, 41, and his nine-year-old son Jack Tomlinson were last seen at their home in Hardens Mead yesterday morning.
It is understood they left the house between 5am and 6am.
Mr Tomlinson is described as a white male, with shaven brown hair and of a slim build. He normally wears glasses but these were left at his home address.
Jack is described as white, taller than average for his age, with mousey brown hair and of a medium build.
At this stage, it is not known what the two were wearing but Mr Tomlinson may be wearing a black Slazenger jacket.
Anyone with information as to the whereabouts of either Mr Tomlinson or Jack should contact Wiltshire Police on 101 immediately or Crimestoppers on 0800 555 111 where information can be left anonymously.