Lee Jeffrey, 22, of Anick Road, Hexham, has not been seen since 10am on Wednesday, April 25.
He is described as being 6ft 3ins tall, slim build, with dark brown hair with a red mohican stripe. He has skull tattoos on one arm and fish tattoos on the other.
He was last seen wearing a black Nike tracksuit top, blue jeans and black Nike trainers.
Members of the public are asked to contact police if they see him or know his whereabouts.