Sir Walter Kieran Prendergast KCVO CMG (born 2 July 1942) is a British retired diplomat who was Under-Secretary-General for Political Affairs at the United Nations. Prendergast was born in Campbeltown, Scotland, and received his education at St Patrick's College, Strathfield in Sydney, Australia. He later went to England and attended Salesian College in Chertsey and then St Edmund Hall, Oxford.