Hundreds of people have rallied outside Parliament House in Hobart in support of same-sex marriage.

As part of the event, Federal election candidates from the Greens, Democrats and Socialist Alliance knocked down a symbolic wall of discrimination.

Rodney Croome from the Gay and Lesbian Rights Group says the Labor and Liberal parties were not represented.

"The people here are saying to both major parties it's time to stop bigotry, stop discrimination," Mr Croome said. "It's time to treat all Australians equally."

The rally was organised to mark six years since the Marriage Act was amended to specifically exclude same-sex couples.