Nathan Ilunga, 13, was last seen yesterday on South Promenade.
Police say Nathan is vulnerable because of his age.
Also in the news: Snow is expected to fall in Yorkshire this EasterHumberside Police said: "We want to speak to him urgently to make sure he is safe and well. We believe he is still in the East Riding area."
When last seen Nathan was wearing a black North Face baseball cap, a two-tone grey puffa jacket, olive green tracksuit bottoms and black Nike trainers.
He is 5ft 4ins and slim.
Call 101 quoting log 387 of 23/03/18.