Today is Do It For Dolly Day, a powerful national day that calls on all Aussies to wear blue, spread kindness, and stand up against bullying.

The day honours Dolly Everett, a kind and creative 14-year-old girl, who tragically took her own life in 2018 after relentless bullying both in person and online.

The Head of Dolly's Dream Sally Sweeney told Peter Fegan on 4BC Breakfast, "Be kind."

"It's as simple as that."

"We know if you start with kindness, such a simple concept, it's not going to lead to bullying and one kind word can change the outcome of someone's day."

"You could, if being that upstander and stepping in for a young person who's being bullied and honestly change the trajectory of their life, so be kind," Mrs Sweeney said.