Thames Valley Police is asking for help tracing a missing man from Wallingford with links to Cornwall.
Mark Jones, aged 35, was last seen in Fir Tree Avenue, Wallingford, on Sunday, March 16.
Mr Jones is white, of medium build, with dark brown hair, brown eyes, 5ft 10ins tall, and often has stubble.
He has long hair, which he sometimes wears in a ponytail or a bun.
It is believed that Mr Jones is wearing dark clothing, including a hooded top and dark boots, and possibly a hat.
He does not have access to any vehicles.
Mr Jones has links to Cornwall, Lancaster, and Edinburgh.
Investigating officer, Det Insp Louise Roddy said: “Mark’s family are extremely concerned for his welfare and desperately want him to come home.
“If Mark is reading this you’re not in any trouble, just please get in touch with your family or police so we know you are safe and well.
“If anyone has any information regarding Mark’s whereabouts please contact the Thames Valley Police Enquiry Centre on 101.
Contact Crimestoppers anonymously on 0800 555 111 or online at www.crimestoppers-uk.org.