Council for a Livable World is a Washington, D.C.-based non-profit advocacy organization dedicated to eliminating the U.S. arsenal of nuclear weapons. Its stated aim is for "progressive national security policies and helping elect congressional candidates who support them." The Council was founded in 1962 as the Council for Abolishing War by Hungarian nuclear physicist Leó Szilárd. Its education and research arm, the Center for Arms Control and Non-Proliferation, provides research to members of Congress and their staff. In February 2016, John F. Tierney was appointed the executive director of the Council for a Livable World and the Center for Arms Control and Non-Proliferation. For more than 50 years, the Council for a Livable World has been advocating for a more principled approach to U.S. national security and foreign policy.

Leo Szilard was a Hungarian born physicist and inventor. He conceived the nuclear chain reaction in 1933, patented the idea in 1936, and in late 1939 wrote the letter for Albert Einstein's signature that resulted in the Manhattan Project that built the atomic bomb. According to György Marx, he was one of the Hungarian scientists known as The Martians.