"There is no question of the Nobel Committee withdrawing the peace prize," director Olav Njolstad said. "The rules of the Nobel Peace Prize do not allow it," he added.
A UN probe released Monday detailed evidence of genocide and crimes against humanity "perpetrated on a massive scale" against the Rohingya, including acts of rape, sexual violence and mass killings.
At a UN Security Council session on Tuesday, a number of countries -- including the United States, Britain, France and Sweden -- called for Myanmar's military leaders to be held accountable.
Suu Kyi won the Nobel Peace Prize in 1991 when she was detained by the military for championing democracy and human rights.
She was only allowed to leave Myanmar to recieve the award 21 years later as the military apparently eased its iron grip on the country.
As the Rohingya crisis has deepened in the past year with the flight of hundreds of thousands to neighbouring Bangladesh, Suu Kyi has come under increasing international pressure to speak out about their plight.
So far however she has said very little and steadfastly avoided any critical comment of Myanmar's military.
The Nobel Peace Prize committee had warned last year about the worsening situation in Myanmar and had urged all parties to do "everything possible to end discrimination against and persecution of minorities."
Njolstad repeated that statement, adding: "This call is not any less timely after the UN report."
The Myanmar government on Wednesday bluntly rejected the UN's findings.
"We didn't allow the (UN Fact-Finding Mission) to enter into Myanmar, that's why we don't agree and accept any resolutions made by the Human Rights Council," government spokesman Zaw Htay said, according to the state-run Global New Light of Myanmar newspaper.
He pointed to the formation of Myanmar's own Independent Commission of Enquiry, which he said was set up to respond to "false allegations made by UN agencies and other international communities."