Andrey Petrovich Kiselyov was a Russian and Soviet mathematician.

Andrey Alexandrovich Klishas is a Russian politician and lawyer serving as the Senator from Krasnoyarsk Krai since 2012. He is a member of the United Russia political party.

Andrey Vladimirovich Kolesnikov is a Russian journalist and expert on Russian politics. He is a senior fellow at the Carnegie Endowment for International Peace. He is also an author of a series of books about Anatoly Chubais.

Andrey Ivanovich Kolesnikov is a Russian journalist, columnist and editor. Since 2000, he has been writing regular reports about Russian president Vladimir Putin for Kommersant as a member of the Kremlin pool. He is an author of several books and articles about Putin's life.

Andrey Nikolaevich Kolmogorov was a Soviet mathematician who contributed to the mathematics of probability theory, topology, intuitionistic logic, turbulence, classical mechanics, algorithmic information theory and computational complexity.

Andrey Aleksandrovich Korolev was a Soviet and Russian philologist, PhD, a scholar in Indo-European and Oriental studies. His main works concerned Celtic and Hittite and other languages of Asia Minor.

Andrey Vitalievich Korotayev is a Russian anthropologist, economic historian, comparative political scientist, demographer and sociologist, with major contributions to world-systems theory, cross-cultural studies, Near Eastern history, Big History, and mathematical modelling of social and economic macrodynamics.

Andrey Alexandrovich Krayevsky was a Russian publisher and journalist, best known for his work as an editor-in-chief of Otechestvennye Zapiski (1839–1867), the influential literary journal of which he was also publisher. Another well-known publication Krayevsky founded was the popular newspaper Golos.

Andrey Vyacheslavovich Kuraev is an Orthodox theologian and missionary and a defrocked Protodeacon of the Russian Orthodox Church.

Prince Andrey Mikhailovich Kurbsky was a Russian political figure, military leader, and political philosopher, known as an intimate friend and then a leading political opponent of the Russian tsar Ivan the Terrible. His correspondence with the tsar provides a unique source for the history of 16th-century Russia.