Konstantin Dmitrievich Nabokov (1872–1927) was a Russian diplomat and author.

[1] Konstantin served as secretary of the Russian delegation during the signing of the Treaty of Portsmouth in 1905.

[2] He also worked as counselor of the Russian Embassy in London from December 15, 1915, to January 17, 1917, before advancing to the position of chargé d'affaires.

[3] The poet Korney Chukovsky alleged in his diary that Konstantin was a homosexual who had taken a fancy to him.

[4] Konstantin was listed as a member of the Grand Orient of Russia’s Peoples, a Masonic lodge.