United States Under Secretary of State for Arms Control and International Security
Seal of the United States Department of State
Incumbent Thomas Dinanno[1] since October 10, 2025
Department of State
Reports to	TheU.S. secretary of state
Seat	Washington, D.C.
Appointer	Thepresident withSenateadvice and consent
Term length	No fixed term
Inaugural holder	Curtis W. Tarr
Formation	1972
Salary	Executive Schedule, Level 3
Website	state.gov/t

Theunder secretary of state for arms control and international security (T) is a position within the U.S.Department of State that serves as a senior adviser to thepresident and thesecretary 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, inNational Security Council (NSC) and subordinate meetings pertaining toarms control,nonproliferation, anddisarmament 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 themissile 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 internationalpeacekeeping 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 theForeign Assistance Act,Arms Export Control Act, and related legislation. The bureaus ofCounterterrorism,Political-Military Affairs,International Narcotics and Law Enforcement Affairs andArms Control and Nonproliferation are under the policy oversight of the Under Secretary for Arms Control and International Security. TheAssistant Secretary of State for Arms Control and Nonproliferation, theCoordinator for Counterterrorism,Assistant Secretary of State for International Narcotics and Law Enforcement Affairs and theAssistant 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 theClinton administration decided to merge theArms Control and Disarmament Agency and theUnited States Information Agency into the State Department, as well as realigning theUnited States Agency for International Development with it.

• The website of the Under Secretary for Arms Control and International Security
• The Office of the Historian's page on Department of State organizational changes during the Clinton administration

• United States under secretaries of state
• 1972 introductions
• Arms control people
• United States national security policy

• Articles with short description
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• Use American English from March 2019
• All Wikipedia articles written in American English
• Use mdy dates from March 2019