Jason King, 50, was reported missing on Sunday, March 13.
He was last sighted on CCTV at Keighley bus station at around 10:30am on Monday, March 14.
Police said they were growing “increasingly concerned” about Jason - who was “potentially spotted in Clitheroe”.
He was last seen wearing blue jeans, grey trainers, a black hoodie, green parka jacket, and a black cap.
He was also carrying a black and red rucksack.