The organisers of Earth Hour took out top honours at the Banksia Environment Awards in Melbourne last night.
Deputy Prime Minister Julia Gillard and Environment Minister Peter Garrett were among the guests at the awards, which recognise environmental excellence, sustainability and education.
Earth Hour claimed the top accolade, the Gold Banksia Award.
Earth Hour director Andy Ridley said the award was a great honour.
Melbourne City Council's Professor Rob Adams was named the Environmentalist of the Year.
The Young Environmentalist of the Year went to the Centre for Sustainable Leadership's Larissa Brown.
Ms Brown established the centre when she was 24, and its flagship program hopes to develop the next generation of environmentally-responsible leaders.
She says receiving the Young Environmentalist of the Year award is a great honour.
"It's wonderful to get recognition for the work that we do at the Centre of Sustainability Leadership," she said.
"We find young people who want to make a more sustainable world and give them all the skills they need to go out there and do that."
Organisers say all the winners stood out because of their practical contributions to the environment.