- American Peace Network
 - Takoma Park - Dedicated to decreasing militarization and working for world peace. - Arms Control Association
- Nonpartisan membership organization dedicated to promoting public understanding of and support for effective arms control policies.
- Association for Conflict Resolution
- Dedicated to the practice and enhancing public understanding on a national and international level.
- Carnegie Commission on Preventing Deadly Conflict
- Looks at international organizations involved in conflict prevention and considers ways to develop a system of nonviolent problem solving.
- Carnegie Endowment for International Peace (2)
- Fund for Peace
- Promotes scholarship, education and research on global problems that threaten human survival, and it searches for practical solutions to those problems.
- Global Peace Services USA
- Dedicated to the creation of a professional body of peacemakers trained in nonviolent action.
- Institute for Science and International Security (ISIS) (2)
- Landmine Clearance International
- McLean - Teaches landmine clearance and provides high technology equipment.
- Pax World Service
- Initiates and supports programs that encourage peacemaking, citizen diplomacy and sustainable development.
- Peace Action@
- Learn about Peace Action, the peace organization formed through the merger of Scientists Against Nuclear Energy (SANE) and Nuclear Weapons Freeze Campaign (The Freeze) which has strived to mobilize peace and nuclear disarmament since 1957. Sites feature its efforts like prevention of nuclear weapon deployment in space and weapon sales to countries abusing human rights as well as information about its regional chapters.
- Sasakawa Peace Foundation USA
- Promotes mutual understanding throughout the Asia-Pacific region, in particular between the U.S. and Japan, through research and cultural programs.
- Search for Common Ground
- Seeks workable solutions to divisive national and international problems.
- Tabula Rasa Institute
- Nonprofit organization that promotes peace, understanding, and cooperation between people, groups, and nations.
- Veterans for Peace (VFP)
- Working toward a world without war through humanitarian actions and dialogue.
- Washington Peace Center
- Nonprofit, anti-racist organization providing education and action resources in the Washington, D.C. metropolitan area.
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