A sample of 2,345 school pupils were questioned in a survey commissioned by the organisation, which promotes charitable activity in secondary schools.
The percentage of young people giving time to charity has grown only slightly, from 29 per cent in 2002 to 30 per cent in 2005.
The research also showed that 60 per cent of teenagers would "do more for charity, given the chance".
Andy Thornton, director of Giving Nation, said: "We still have a long way to go in showing that the eradication of poverty needs more than cash. But what we're seeing in these results is the willingness of teenagers to get more involved."
The findings echo those published by the British Market Research Bureau, showing an increase in donations from 11 to 19-year-olds (Third Sector, 9 November).
The BMRB findings attributed this rise to the proliferation of celebrities' endorsements of charities. But Thornton believes that, although celebrities played a part in attracting donors in 2005, the past four years have actually seen a decrease in the number of young people influenced by celebrities.
He said Giving Nation would now be working to make teenagers realise that they are part of a generous generation because it is peer pressure that really has an impact.
In the wake of the Home Office's publication of the report A Generous Society, Giving Nation will be working with the Charities Aid Foundation to set up a network of school charity accounts in a bid to continue to increase awareness of charity among young people.
Giving Nation has also received government funding to expand into primary schools.
It aims to have a pilot in about 100 schools by the start of the academic year in September, which it wants rolled out nationally next year. It will not be called Giving Nation, although the name for the new project has yet to be decided.