Leo Szuman reportedly vanished from the garden in Springfield Garth, Norton, Malton.
Cops have appealed for information on his whereabouts this morning.
North Yorkshire Police tweeted: “Have you seen missing 6-year-old Leo Szuman?
“Reported missing at 11.53am today. Wearing a grey shirt and black trainers.”
People have been asked to dial 999 if they spot him.