The young teenager named Mason who is described as white, 6ft, of a heavy build, with brown hair and blue eyes was last seen on Sunday, August 27, around 5.50pm.
He was last seen near the sports centre on Corkerhill Road heading towards Pollok and was wearing blue jogging bottoms, a blue jogging top and black shoes.
Inspector Manjit Singh-Kaila, Partick Police Office, said: “Mason is quite distinctive due to his height and so we are hoping that someone will have seen him about.
“There is growing concern for his welfare and we would ask anyone who knows where he is or who may have information that will help us find him to get in touch with police.
Those with information should contact Police Scotland on 101 and quote incident number 3030 of Sunday, August 27.