|Full name||Georgi Nikolov Dermendzhiev|
|Date of birth||4 January 1955|
|Place of birth||Plovdiv, Bulgaria|
|Levski Sofia (manager)|
|1999–2008||Litex Lovech (assistant)|
|2008||Botev Plovdiv (assistant)|
|2011–2014||Ludogorets Razgrad (assistant)|
|* Senior club appearances and goals counted for the domestic league only|
After managing Spartak Plovdiv as a head coach for one season, he became an assistant at Litex Lovech under Ferario Spasov. He remained in this role for several years, followed by short spells at Botev Plovdiv and Sliven. He later briefly managed the latter during the 2010-11 A Group, but was unable to help them avoid relegation.
On July 31, 2014, Dermendzhiev replaced Stoycho Stoev as head coach at Ludogorets following the latter's disappointing 0-0 home draw against Partizan Belgrade in a Champions League qualifying match. Before this Georgi worked with Stoev and Ivaylo Petev as an assistant manager since 2011.
On 27 August 2014, Dermendzhiev became the second Bulgarian manager (after Stanimir Stoilov in 2006) to qualify a team from his country to the group stage of the Champions League. On 22 October 2014 he became the first Bulgarian coach to achieve a win in the Champions League's group phase when Ludogorets beat Basel.
In the 2016–17 Champions League Ludogorets won the qualifiers against Mladost Podgorica and Red Star Belgrade, and the play-off against Viktoria Plzeň, respectively, thus becoming the first Bulgarian team to qualify twice for the group stage of the tournament, both times with Georgi Dermendziev as a coach.
- As of 19 February 2019
|Ludogorets Razgrad||31 July 2014||31 May 2015||47||24||12||11||51.06||92||50||+42|
|6 November 2015||10 August 2017||84||53||17||14||63.10||184||74||+110|
|Ordabasy||9 January 2018||22 January 2019||35||14||8||13||40.00||45||45||0|
|Levski Sofia||22 January 2019||1||0||1||0||0.00||1||1||0|
- Slavia Sofia
- Winners (1): 1979–80
- Ludogorets Razgrad
- Winners (1): 2014
- Bulgarian Manager of the Year:
- Winner (1): 2014
-  История на Спартак
- "В Лудогорец Георги Дерменджиев е архитектът в сянка, помощник-треньорът на шампионите записа 54-и мач в Европа" (in Bulgarian). 7sport.net. 5 October 2013. Retrieved 2015-05-21.
- "Дерменджиев: във футбола няма невъзможни неща, дано не започнем срещу Реал" (in Bulgarian). topsport.bg. 28 August 2014. Retrieved 2014-08-29.
-  Най-сетне
-  Лудогорец обяви новия наставник
- Официално: Дерменджиев вече не е треньор на Лудогорец
- Георги Дерменджиев подписва с Ордабасъ (Шимкент)
- Георги Дерменджиев е новият старши треньор на Левски
- Dimitrov, Ivaylo (17 February 2015). "Владислав Стоянов е най-добрият български футболист за 2014 година! Лудогорци обраха почти всички индивидуални награди". topsport.bg. Retrieved 18 February 2015.