Yukio Takasu (高須幸雄, Takasu Yukio) is a Japanese diplomat and the former United Nations Under-Secretary-General for Management. Previously, he was the Special Adviser on Human Security to the United Nations Secretary-General. Takasu also served as Advisor to the Japanese Foreign Minister and as Professor at the University of Tokyo. Since 2011, Takasu has taught at Ritsumeikan University in Kyoto. He was Permanent Representative and Ambassador Extraordinary and Plenipotentiary at the Permanent Mission of Japan to the United Nations in New York. Takasu has also twice served as President of the United Nations Security Council, once in February 2009 and again in April 2010.