Code Pink: Women for Peace is an internationally active left-wing anti-war 501(c)(3) organization that focuses on issues such as drone strikes, the Guantanamo Bay detention camp, Palestinian statehood, the Iran nuclear deal, human rights in Saudi Arabia, and peace on the Korean Peninsula. The organization has regional offices in Los Angeles, California, and Washington, D.C., and many more chapters in the U.S. and several other countries.

An anti-war movement is a social movement, usually in opposition to a particular nation's decision to start or carry on an armed conflict. The term anti-war can also refer to pacifism, which is the opposition to all use of military force during conflicts, or to anti-war books, paintings, and other works of art. Some activists distinguish between anti-war movements and peace movements. Anti-war activists work through protest and other grassroots means to attempt to pressure a government to put an end to a particular war or conflict or to prevent it in advance.