Aleksandr Aleksandrovich Kharkevich was a specialist in radio engineering, electronics, acoustics and instrumentation. He was a corresponding member in 1960 and an academician in 1964 of the Academy of Sciences of the Soviet Union.

Aleksandr I. Kolpakidi is a Russian writer and historian. He is a bestselling author.

Alexandr Mikhailovych Kondratov was a Russian linguist, biologist, journalist and poet. He wrote many books on subjects as varied as ancient and modern languages, history, mathematics, paleontology, geology, cryptozoology, and Atlantis. He also wrote poetry. He was the first Russian to write a monography about dinosaurs purportedly surviving into modern times.

Alexander Alexandrovich Kornilov was a Russian historian and liberal politician.

Alexander Borisovich Kosarev was a Soviet-Russian film director, writer, actor, poet and lyricist.

Aleksandr Yefimovich Kurlyandsky was a Soviet and Russian writer, satirist, playwright, screenwriter, and author of books for children. He was born and died in Moscow, and was an Honored Art Worker of the Russian Federation (2007). He was also awarded the USSR State Prize (1988).

Aleksandr Gennadyevich Kurosh was a Soviet mathematician, known for his work in abstract algebra. He is credited with writing The Theory of Groups, the first modern and high-level text on group theory, published in 1944.

Alexander Ivanovich Levitov (Russian: Алекса́ндр Ива́нович Леви́тов; August 1, 1835 – January 16, 1877), was a Russian writer.

Aleksandr Pavlovich Lopukhin was a Russian Bible commentator best known for the Lopukhin Bible (1904).

Aleksandr Nikolayevich Maksimov was a Soviet ethnographer who focused on the history of the family, the clan and the economy.