Alexander Karasyov is a Russian writer living in St. Petersburg, Russia.

Alexander Kasimovich Kazembek, born Muhammad Ali Kazim-bey, was an orientalist, historian and philologist. He was the great-grandfather and namesake of the Mladorossi founder Alexander Kazembek.

Alexand(e)r Dmitriyevich Kastalsky was a Russian composer and folklorist.

Alexander Kaufmann was a German poet and folklorist from Bonn.

Alexander Petrovich Kazantsev was a popular Soviet and Russian science fiction writer, ufologist and chess composer.

Alexander Kazbegi (1848–1893) was a Georgian writer, famous for his 1883 novel The Patricide.

Alexander Petrovich Kazhdan was a Soviet-American Byzantinist. Among his publications was the three-volume Oxford Dictionary of Byzantium, a comprehensive encyclopedic work containing over than 5,000 entries.

Alexander Kennedy Isbister was born at Cumberland House, Rupert's Land. He was an HBC employee in his early career and later was a lawyer and an educational writer and author of many school books.

Alexander Fyodorovich Kerensky was a Russian lawyer and revolutionary who led the Russian Provisional Government and the short-lived Russian Republic for three months from late July to early November 1917.

Aleksandr Solomonovich Khakhanov born Aleksandre Khakhanashvili was a Georgian-Russian historian, archaeologist, and one of the most acclaimed scholars of Georgian literature.