Sergey Mikhailovich Grigoriants (Russian: Сергей Михайлович Григорьянц; born 2 November 1983) is a Russian chess grandmaster who represents Hungary.

[1] In 2004, he shared first place with Evgeny Najer, Kaido Külaots, Artyom Timofeev, Zoltan Gyimesi and Oleg Korneev in the Cappelle-la-Grande Open tournament.

[2] The following year, Grigoriants attained the title of Moscow Champion.

[3] In 2018 he married the Hungarian chess player Petra Papp.

[4] This biographical article relating to a Russian chess figure is a stub.