Simon Morris, 51, was last seen on Blackpool Old Road, Poulton at around 6pm on Saturday (December 7).
His family haven’t seen or heard from him since, behaviour which they say is "very unusual".
Lancashire Police are growing "very concerned" for his welfare.
Simon is described as white, around 6ft 1ins, of medium build with dark hair and is clean shaven.
He was last seen wearing a dark brown coat, dark pants and black shoes.
Anyone with information is being asked to call 101 quoting log number 587 of December 8.