Sir Kieran Prendergast (born July 1942) is a former British diplomat and Under-Secretary-General for Political Affairs at the United Nations and former non-executive director at corporate intelligence agency Hakluyt & Company.
As well as working for the UN, Prendergast has worked as consul-general in Tel Aviv, Israel, has served as High Commissioner to Zimbabwe and Kenya, and as Ambassador to Turkey. 
In 1997, United Nations Secretary General Kofi Annan appointed Sir Kieran Under-Secretary-General for Political Affairs at the United Nations and served in that position until 2005. He helped call attention to human rights violations and ethnic cleansing resulting from the War in Darfur, and was deeply involved in Cyprus reunification negotiations in 2004. When he resigned in 2005, Kofi Annan thanked him for his “outstanding service” and “invaluable advice.”
When Norman Baker brought the House of Commons' attention to Hakluyt in 2010 by asking how many meetings had the government held with the agency, Prendergast's name was mentioned, alongside Niall Fitzgerald, Keith Craig, Sir Rod Eddington, Robert Webb QC and Mark Getty.
Since resigning from the UN, Prendergast has carried out research at the Belfer Center for Science and International Affairs