Fallon, WCRS, Hooper Galton and Karmarama have all created ads that will appear in the May issue of the magazine. Readers will be invited to vote for their favourite.
The winning ad will be distributed with the October issue, which readers will be encouraged to put up in their schools and youth clubs, as well as being sent to 2,000 schools nationwide.
The campaign, which has been given the title Stand Up, Speak Out, aims to unite teenage girls against bullying, violence and intimidation.
Annabel Brog, the editor of Sugar, said: "The reason Sugar launched the poster leg of the campaign is because we want girls to feel empowered ... this is their campaign, so they can choose the image to front it, and distribute it in their worlds.
"I think it is only by involving teenagers in the way we deal with their issues that we can help to make their world easier to live in."