|Georgi S. Nadjakov|
|Born||26 December 1896
|Died||24 February 1981 (aged 84)
|Institutions||Institute of Physics, Bulgarian Academy of Sciences|
|Alma mater||Sofia University|
Georgi Nadjakov (also spelled Georgi Nadzhakov) (Bulgarian: Георги Наджаков) (26 December 1896 – 24 February 1981) was a Bulgarian physicist. He became 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).
Georgi Nadjakov experimentally investigated photoconducting properties of sulphur. He prepared the permanent photoelectret state of matter for the first time and published his paper in 1937  and 1938. He called the electret discovered by Mototaro Eguchi in 1919, thermoelectret and the electret discovered by him in 1937, photoelectret.
Photoelectrets were the most notable achievement of Georgi Nadjakov. Its practical application led to the invention of the photocopier by Chester Carlson some years later.
- Nadjakov Glacier on Graham Land in Antarctica is named after Georgi Nadjakov.
- Institute of Solid State Physics is since 1982 known as Georgi Nadjakov Institute of Solid State Physics. Its predecessor was founded by Georgi Nadjakov in 1946.
The study of Georgy Nadjakov is a Historic Site of the European Physical Society since 23 May 2014.
- Academician George Stefanov Nadjakov, on the site of the Institute of Solid State Physics at the Bulgarian Academy of Sciences
- Institute of Solid State Physics
- "Georgi Nadjakov, SUR UNE NOUVELLE ESPECE DE POLARISATION PERMANENTE DES DIELECTRIQUES". Comptes rendus de l'Académie des Sciences de Paris. 204: 1865–1866. 1937.
- "G. Nadjakov, UBER EINE NEUE ART VON ELEKTRETEN: PHOTOELEKTRETEN". Physikalische Zeitschrift. 39 (6): 226–227. 1938.
- "Photoelectret State of Matter".
- Kao, Kwan-Chi (2004). "5: Electrets". Dielectric Phenomena in Solids. Academic Press. p. 283. ISBN 0123965616. Retrieved November 2013. Check date values in:
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