Guido Beck (August 29, 1903 – October 21, 1988) was a physicist born in what was then the town of Reichenberg in the Kingdom of Bohemia (Austria-Hungary), and is now Liberec in the Czech Republic. He studied physics in Vienna and received his doctorate in 1925, under Hans Thirring. He worked in Leipzig in 1928 as an assistant to Werner Heisenberg. A combination of the troubled political climate of Europe in the 1930s, his own restlessness, and the Nazi persecutions in Germany, made the Jewish-born Beck a traveler in those years. Until 1935 he worked in Cambridge with Ernest Rutherford, Copenhagen, Prague, United States and Japan.