Wait, what?
I thought it was a prize for individuals, not organizations.
Let's see...
Institute of International Law (1904)
Permanent International Peace Bureau (1910)
International Committee of the Red Cross (1917, 1944, 1963)
Nansen International Office for Refugees (1938)
Friends Service Council and American Friends Service Committee (1947)
United Nations High Commissioner for Refugees (1954, 1981)
League of Red Cross Societies (1963)
UNICEF (1967)
international Labour Organization (1969)
Amnesty International (1977)
International Physicians for the Prevention of Nuclear War (1985)
United Nations Peace-Keeping Forces (1988)
Pugwash (1995)
International Campaign to Ban Landmines (1997)
Doctors Without Borders (1999)
United Nations (2001)
International Atomic Energy Agency (2005)
Grameen Bank (2006)
Intergovernmental Panel on Climate Change (2007)
Nothing unusual