14-year-old Jason Vu disappeared without a trace on Christmas Eve.
He was last seen at his home in the 2200 block of South 23rd Street when his father saw him leave the house around 8:00 a.m.
Investigators checked the house, and contacted his friends and family with no luck. Police say they have also checked area hospitals.
Vu is 5'4" tall and weighs 140 pounds.
He was wearing a black hooded sweathshirt and blue jeans.
Anyone with any information on Vu's whereabouts is being urged to call Philadelphia Police at 215-686-3013 or the National Center for Missing & Exploited Children at 1-800-843-5678 (1-800-THE-LOST)