Police are growing “increasingly concerned” about the teenager who was last seen in Milton Keynes on Sunday.
Steven Tiffin was last seen at an address in Century Avenue, Oldbrook at 12.30am by a relative wearing jeans and a grey hooded top.
The 14-year-old is from Buckingham and has links to Aylesbury, Milton Keynes, Oxford and Northamptonshire.
He is white, 5ft 10ins, of slim build with short mousey brown hair.
Det Chief Inspector Richard North from Milton Keynes Force CID said: “I am appealing for anyone who has seen Steven or anyone matching his description to contact police.
“We are growing increasingly concerned about Steven’s whereabouts. It is possible that Steven is still in the Milton Keynes area however it is possible that he may have travelled out of the area to London.
“If you see this appeal Steven please call 101 and let us know you are safe.”
If you have any information about Steven’s whereabouts lease call the 24-hours Thames Valley Police enquiry centre on 101 quoting occurrence number 43140092907.
If you don’t want to speak directly to the police, you can contact the independent charity Crimestoppers anonymously on 0800 555 111.
No personal details are taken, information is not traced or recorded and you will not go to court.