The International Committee on f the Red Cross has won the Nobel Peace Prize 3 times. The United Nations High Commissioner for Refugees has won it twice. No individual has won it more than once, and all other winners won only once. Linus Pauling did win two Nobel Prizes, one the Peace prize, and the other in Chemistry, the only person to win two unshared prizes.
For more, see http://en.wikipedia.org/wiki/List_of_Nobel_Peace_P... .