The scheme has been launched to prevent incidents of bullying at the school, with pupils from different year groups trained provide support to other students who report issues.
The anti-bullying ambassadors were announced in a special assembly this week to mark the start of Anti-Bullying Week, a national campaign to stop bullying and create safer environments for children and young people.
Prince William School is also unveiling a series of posters around the school and will be showing PowerPoint presentations in tutor lessons, both created by pupils to raise awareness of bullying.
Headteacher Elizabeth Dormor said: “Bullying is increasingly rare at Prince William School and we want to keep it that way, which is why we are taking part in Anti-Bullying Week, including the launch of our new anti-bullying ambassadors.
“These pupils will have a private room where they will be based at lunchtimes, and other students can come and see them to talk about any issues they’re experiencing.
“It is vital to talk to someone if you think you may be a victim of bullying and we are confident that our anti-bullying ambassadors will play a key role in helping to prevent bullying in our school.”
Emily-Jayne Bullivant, who is one of the student anti-bullying ambassadors, said: “We want to offer a place where students can come and talk to us about anything. Some might find it difficult to speak to a teacher and they might be more comfortable talking to someone their own age.”