More than 1.2 million people visited the venue at 143 events in 2009, including heads of state, politicians and NGOs from across the world.
"2009 has in every respect been a fantastic year for both Bella Center and Forum," said managing director Arne Bang Mikkelsen. "Just the fact that the US President Barack Obama has been here twice speaks for itself. The climate conference was the biggest event ever for Bella Center, while 2009 was also particularly busy for forums."
The UN's 13-day climate conference attracted 170,000 delegates, including politicians, activists, civil servants and journalists.
The Olympic IOC congress and the international medical congress EULAR attracted 17,000 delegates.