David Reaney was last seen at home on Main Road at around 6pm on Thursday May 5. On Saturday May 7 a family member spoke to him, and he mentioned going for a walk in the Grindleford area.
The 81-year-old has not been seen or heard from since.
He is described as white, 5ft 9ins tall and of slim build. He has brown eyes and grey hair and wears glasses.
Anyone who has seen David, or has any information about his whereabouts should contact police, quoting reference 873 of May 9 by calling 101 or via the online contact form at https://www.derbyshire.police.uk/ContactUs.
You can also contact the independent charity Crimestoppers anonymously, on 0800 555 111.