Australian-born Crown Princess Mary of Denmark delivers the opening address at the European IDAHO forum, calling for "a life of dignity for all".

Princess Mary of Denmark has delivered the opening address at the European IDAHO (International Day Against Homophobia, Transphobia, and Biphobia) Forum in Copenhagen on Tuesday.

The Australian-born crown princess welcomed European ministers, government representatives, and advocacy groups to the three-day conference on LGBTQI rights, now in its fourth year, and showed her continued support for the rights of same sex-attracted and gender diverse people.

"We must be united in the fight against discrimination [in the hopes of] a life of dignity for all," she said.

The theme of this year's event is 'Building Bridges and Alliances' to highlight the need for social acceptance of LGBTQI individuals in the workforce.

In 1989, Denmark was the first country in the world to allow same-sex couples to enter into civil unions. In 2012 its parliament voted overwhelmingly in favour of allowing gay people to marry, a right which has since been extended to Denmark's two constituent countries, Greenland and the Faroe Islands.

In August 2015, the Danish capital Copenhagen also opened its first LGBTQI aged care residence.