The under secretary of state for arms control and international security (T) is a political appointment within the U.S. Department of State that serves as a senior adviser to the president and the secretary of state for arms control, nonproliferation, and disarmament.

In this capacity, the under secretary (U/S) attends and participates, at the direction of the president, in National Security Council (NSC) and subordinate meetings pertaining to arms control, nonproliferation, and disarmament and has the right to communicate, through the secretary of state, with the president and members of the NSC on arms control, nonproliferation, and disarmament concerns.

The U/S also leads the interagency policy process on nonproliferation and manages global U.S. security policy, principally in the areas of nonproliferation, arms control, regional security and defense relations, and arms transfers and security assistance. The U/S provides policy direction in the following areas: nonproliferation, including the missile and nuclear areas, as well as chemical, biological, and conventional weapons proliferation; arms control, including negotiation, ratification, verification and compliance, and implementation of agreements on strategic, non-conventional, and conventional forces; regional security and defense relations, involving policy regarding U.S. security commitments worldwide as well as on the use of U.S. military forces in unilateral or international peacekeeping roles; and arms transfers and security assistance programs and arms transfer policies.

By delegation from the secretary, the U/S performs a range of functions under the Foreign Assistance Act, Arms Export Control Act, and related legislation. The bureaus of Counterterrorism, Political-Military Affairs, International Narcotics and Law Enforcement Affairs and Arms Control and Nonproliferation are under the policy oversight of the Under Secretary for Arms Control and International Security. The assistant secretary of state for arms control and nonproliferation, the coordinator for counterterrorism, assistant secretary of state for international narcotics and law enforcement affairs and the assistant secretary for political-military affairs all report to the under secretary for arms control and international security.

According to the Office of the Historian of the U.S. Department of State, the under secretary first received the permanent title "Senior Adviser to the President and the Secretary of State for Arms Control, Nonproliferation and Disarmament" when the Clinton administration decided to merge the Arms Control and Disarmament Agency and the United States Information Agency into the State Department, as well as realigning the United States Agency for International Development with it.

List of under secretaries of state

International security affairs, 1972–1993

#NameAssumed officeLeft officePresident served under
1Curtis W. TarrMay 2, 1972November 25, 1973Richard Nixon
2William H. DonaldsonNovember 26, 1973May 10, 1974Richard Nixon
3Carlyle E. MawJuly 10, 1974September 17, 1976Gerald Ford
4Lucy W. BensonMarch 28, 1977January 5, 1980Jimmy Carter
5Matthew NimetzFebruary 21, 1980December 5, 1980Jimmy Carter
6James L. BuckleyFebruary 28, 1981August 20, 1982Ronald Reagan
7William Schneider Jr.September 9, 1982October 31, 1986Ronald Reagan
8Ed DerwinskiMarch 24, 1987January 21, 1989Ronald Reagan
9Reginald BartholomewApril 20, 1989July 7, 1992George H. W. Bush
10Frank G. WisnerJuly 20, 1992January 19, 1993George H. W. Bush

Arms control and international security, 1993–present

#NameAssumed officeLeft officePresident served under
11Lynn Etheridge DavisApril 1, 1993August 8, 1997Bill Clinton
12John D. HolumDecember 1, 1997August 7, 2000Bill Clinton
13John R. BoltonMay 11, 2001July 31, 2005George W. Bush
14Robert JosephJune 1, 2005March 2, 2007George W. Bush
-John Rood (acting)September 26, 2007January 20, 2009George W. Bush
15Ellen TauscherJune 26, 2009February 7, 2012Barack Obama
16Rose GottemoellerFebruary 7, 2012 Acting: February 7–March 7, 2014October 12, 2016Barack Obama
-Thomas M. Countryman (acting)October 12, 2016January 27, 2017Barack Obama/Donald Trump
-C.S. Eliot Kang (acting)January 27, 2017January 9, 2018Donald Trump
-Christopher Ashley Ford (acting)January 9, 2018April 30, 2018Donald Trump
17Andrea L. ThompsonApril 30, 2018October 20, 2019Donald Trump
-Christopher Ashley Ford (acting)October 21, 2019January 8, 2021Donald Trump
-Marshall Billingslea (acting)January 11, 2021January 20, 2021Donald Trump
-C.S. Eliot Kang (as Senior Official)January 20, 2021July 21, 2021Joe Biden
18Bonnie JenkinsJuly 22, 2021December 31, 2024Joe Biden
-C.S. Eliot Kang (acting)January 1, 2025January 20, 2025Joe Biden
-Brent T. Christensen (as Senior Official)January 20, 2025October 10, 2025Donald Trump
19Thomas DiNannoOctober 10, 2025IncumbentDonald Trump

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