North Yorkshire Police are becoming increasingly concerned for the welfare of 16-year-old Ryan Gregory from Scarborough.
Ryan was last seen on Dean Road, Scarborough at around 5.30pm on February 4.
A North Yorkshire Police spokesman said: "Enquiries have been on-going to locate him since he was reported missing. Ryan is described as being white, 5feet 8inches tall, of slim build with short dark brown hair.
"When last seen he was wearing bright red Adidas hoody, navy blue Adidas tracksuits with Adidas written up the left leg, wearing blue Adidas trainers and carrying a black man bag wit Adidas white writing.
"Ryan is known to frequent the Scarborough area. Ryan, or anyone who has seen him, or knows of his whereabouts, is asked to call North Yorkshire Police on 101."