Harry Potter wins First Light award
Harry Potter And The Prisoner of Azkaban producer David Heyman said it was an "honour and a privilege" for the film to be voted Film of the Decade at the First Light Awards.
David was presented with the special award at the ceremony in the Odeon Leicester Square by Thor star Tom Hiddleston and Harry Potter star Clemence Poesy.
He said: "It's especially exciting and moving to be voted Film of the Decade by children aged five to 15.
"We made the film for children of all ages from 5 to 105 really, but clearly a core part of our audience is young people and to be honoured is a privilege."
Tom added: "I saw this film when I was 25 and I loved it, so there you go."
Clemence Posey, who plays Fleur Delacour in the films, said she was sad that the franchise was coming to an end with the release of Harry Potter And The Deathly Hallows: Part 2 this summer.
She said: "I remember my last day of shooting which was the last day for a lot of people, and some of them had been there for more than 10 years, so it really became very emotional."
First Light, which is supported by the National Lottery through the UK Film Council, provides funding and expertise to enable five to 19-year-olds to make their own short digital films and media projects.
The annual awards celebrate what the young people have done, helping to encourage the next generation of British filmmakers.
Celebrity presenters included Dougray Scott, Rupert Penry-Jones, Tamsin Greig, Hugh Dennis and Joanne Froggatt.