Rickson Ashcroft was last seen in the Blackburn area at around 6pm on Wednesday, June 2.
The 68-year-old is believed to have links to Accrington.
A spokesman for Lancashire Police said: "We are becoming increasingly concerned for the welfare of 68-year-old Rickson Ashcroft, who is missing from his home in Blackburn.
"If you have seen Rickson or have any information, please call us on 101 quoting LC-20210605-0477.
"Please share this post and thanks for your help."
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