Iestyn, 15, was last seen in Abergavenny at around 7.30pm on Tuesday 28 June and officers are concerned for his welfare.
He is described as white, of slim build, around 5’ 7” tall and has red hair.
Iestyn was last seen wearing black trousers and a navy coat.
He has links to the Newport, Cardiff and Pontypridd areas.
Anyone with any information on his whereabouts is asked to call Gwent Police on 101 quoting log 2200216452
You can also contact police via direct message on Facebook or Twitter.
Iestyn is also urged to get in contact to confirm he is safe and well.
