Georgi Nadjakov (also spelled Georgi Nadzhakov or Nadjakov; Georges Nadjakoff) (Bulgarian: Георги Наджаков) (7 January [O.S. 26 December] 1897 – 24 February 1981) was a Bulgarian physicist. He was a corresponding member of the Göttingen Academy of Sciences (1940) in Germany, member of the Bulgarian Academy of Sciences (1945) and member of the Russian Academy of Sciences (1958).