The charity is teaming up with the Daily Mirror and Argos to provide anti-bullying packs to secondary schools throughout the UK during a 10-day campaign.
Cowell has been known to reduce contestants to tears and even prompted Paula Abdul, his fellow judge on American Idol, to walk out because of his barbed comments. Some of his most brutal judgements include: "You sing like Mickey Mouse on helium" and "You dress better than you sing, and you got dressed in the dark".
But the BMG record company executive showed a more caring side when he invited a group of children who have been bullied to his offices to launch the campaign last week and confessed that he was once a victim of bullying himself.
He said: "It happened to me and my friends too. But it's the people who are picked on that are the cool ones. The bullies are the ones with the problem."