Ashot Nadanian (September 19, 1972 in Baku) is an Armenian International Master of chess (1997) and FIDE Trainer (2007).
Played in the 32nd Chess Olympiad (1996), in the Zonal Tournament in Panormo (1998), when he came =7th and narrowly failed to qualify for the FIDE World Chess Championship of 1999. In 2000, he played in the 1st European Individual Chess Championship. He came =7th in Armenian Chess Championship of 1999.
Other results include: =1st at Czestochowa 1992; 1st at Tbilisi 1996; =1st at Pasanauri 1997; =4th at New York 1998; =2nd at Moscow 2004; =6th at Kuala Lumpur 2006; =2nd at Tarakan 2008; =3rd at Kuala Lumpur 2008; =6th at Seoul 2008; =7th at Jermuk 2011.
In 1998, Nadanian was awarded the title of Honoured Coach of Armenia and in 2007 FIDE Trainer. He coached the Kuwait National Team from 1999 to 2001 and Singapore National Team from 2005 to 2010. His students include Grandmasters Gabriel Sargissian, Varuzhan Akobian and Davit G. Petrosian. Since 2011, he has been a permanent second of the world's number two, Levon Aronian.
He has made a number of contributions to opening theory, the most notable of which is the Nadanian Variation of the Grunfeld Defence (1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.Na4).
Author Tibor Karolyi devoted a chapter of his 2009 book Genius in the Background to Nadanian, calling him "Kasparov's Half-Brother".