Evgenii Georgievich Dyakonov (Russian: Евгений Георгиевич Дьяконов) (July 2, 1935 – August 11, 2006) was a Russian mathematician.

He worked at the Moscow State University.

He authored over hundred papers and several books.

Dyakonov was recognized for his pioneering work in the 60s–80s on efficient spectrally equivalent preconditioning for linear systems and eigenvalue problems.

Dyakonov, E.G. (2004), "On spectral problems in energy spaces on composite manifolds with singular geometry of the blocks: I", Differential Equations, 4 (7): 934–946, doi:10.1023/B:DIEQ.0000047024.18841.44, S2CID 195368332