Sergey Ivanovich Kislyak (born 7 September 1950) is a Russian diplomat, and has served as Russia's Ambassador to the United States since 2008.
After graduating from the Moscow Engineering Physics Institute in 1973 and the USSR Academy of Foreign Trade in 1977, Kislyak joined the Soviet Ministry of Foreign Affairs. From 1981 to 1985, Kislyak was the Second Secretary at the Permanent Mission of the Soviet Union to the United Nations in New York City. From 1985 to 1989, Kislyak was First Secretary, Counsellor at the Embassy of the Soviet Union in Washington, D.C.. From 1989 to 1991, Kislyak was Deputy Director of the Department of International Organisations at the Soviet Foreign Ministry. From 1991 to 1993, Kislyak was Deputy Director of the Department of International Scientific and Technical Cooperation at the Russian Ministry of Foreign Affairs.
From 1993 to 1995, Kislyak was Director of the Department of International Scientific and Technical Cooperation. From 1995 to 1998, Kislyak was Director of the Department of Security Affairs and Disarmament at the Russian Foreign Ministry. In 1998, Kislyak was the Ambassador of Russia to Belgium with a residence in Brussels, and he also served as Permanent Representative of Russia to NATO. From 2003 to 2008, Kislyak served as Deputy Ministry of Foreign Affairs. Kislyak became the Ambassador of Russia to the United States on 26 July 2008, and was appointed by Russian President Dmitry Medvedev.