Newsround knows it can be really hard and upsetting if you're being bullied at school or online.
Lots of you have told us it's the biggest worry that you have.
A special programme on CBBC called "Bullying - The Newsround Debate" has been made to get viewers to share their experiences.
It was part of Anti-Bullying Week.
We wanted to find out what you think is the best way to stop bullying.
Top policewoman Olivia Pinkney looks after important issues that affect children and has responsibility for internet safety.
You can also listen to children asking David Warburton MP questions about bullying in schools.
He is a politicians that looks into bullying and reports back to the Government on what can be done to stop it.
He also used to be a teacher.