Barry Nicholson is 75-years old and is described as a white male,. 5ft tall with a long white beard and grey hair.
Members from the Calder Valley Search and Rescue team have also been assisting with the search for Mr Nicholson since 10pm last night.
They were stood down after searching areas of interest.
Anyone with information on the whereabouts of Mr Nicholson should call police on 101.