Joseph Rotblat, Polish-English physicist and academic, Nobel Prize laureate (d. 2005)
Sir Joseph Rotblat (4 November 1908 – 31 August 2005) was a Polish physicist, a self-described "Pole with a British passport". During World War II he worked on Tube Alloys and the Manhattan Project, but left the Los Alamos Laboratory on grounds of conscience after it became clear that Germany had ceased development of an atomic bomb in 1942.

His work on nuclear fallout was a major contribution toward the ratification of the 1963 Partial Nuclear Test Ban Treaty. A signatory of the 1955 Russell–Einstein Manifesto, he was secretary-general of the Pugwash Conferences on Science and World Affairs from their founding until 1973 and shared, with the Pugwash Conferences, the 1995 Nobel Peace Prize "for efforts to diminish the part played by nuclear arms in international affairs and, in the longer run, to eliminate such arms."