Police are appealing for any information on the whereabouts of 55-year-old Mark Reginald Pettifer who has not been seen or heard from since June 25.
Mark was last seen in the Semilong area of Northampton.
He is described as white, small build and around 5ft 7ins tall.
He was last seen wearing a black coat, light blue jeans, white trainers and was carrying a black rucksack, although his clothing may since have changed. He was also seen wearing two gold signet rings on his right hand.
Officers are concerned about his wellbeing and believe he may be sleeping rough.
Anyone with any information can call Northamptonshire Police on 101. Alternatively, they can call the independent charity Crimestoppers anonymously on 0800 555 111 or use the anonymous online form at www.crimestoppers-uk.org.