5ft 8" tall 15 year old Natnael Yemane, an Ethiopian, carried the Olympic torch as part of the International Inspiration programme, a games sponsored initiative to encourage children at home and abroad to do more physical exercise.
But shortly after completing his section of the relay in Nottinghamshire, he has disappeared and police are looking for him.
It is not believed any foul play has taken place and officials believe he has family in London.
Officers said he left the hotel where he was staying, the Jurys Inn, Waterfront Plaza, Nottingham, at around 9.15pm yesterday and did not return.
Natnael is described as black, , and of thin build. He has short cropped hair and was last seen wearing faded dark jeans, a green and yellow camouflage hooded jacket and black trainers with a white stripe.
It has already help 12.9 million children and young people have actively participated in sport, physical education and play as a direct result of International Inspiration – many for the first time in their lives.
"We are concerned for Natnael as he does not speak very good English and is not thought to be streetwise. He does have family in London, but we need to find him and make sure he is safe and well."
The programme embodies the promise made by Seb Coe, the Chair of the London Organising Committee of the Olympic and Paralympic Games (Locog), at the Singapore bid in 2005 to "reach young people all around the world and connect them to the inspirational power of the Games so they are inspired to choose sport".
Around 113,000 teachers, coaches and young leaders have been trained to lead sport, physical education and play in their schools and communities, learning new skills.
There are 273 International Inspiration overseas schools linked with 273 schools in the UK.
Working with policy-makers, practitioners and participants, International Inspiration is working to create long-term, transformational change for young people around the world through and beyond the Games in 2012.