Thomas Faulds was reported missing by his family after he was last seen in Hallcraig Street, Airdrie around 12.23pm on Tuesday, December 15.
The 52-year-old is from Bellshill.
He is described as 5ft 5ins tall and slim build with grey hair.
He also wears black glasses and was last seen wearing a blue padded jacket.
Anyone with information is urged to contact Police Scotland on 101 with reference 2147.