2 Leonhard Euler(Mathematician, Physicist)
Leonhard Euler was a Swiss physicist, mathematician, logician, geographer, astronomer, and engineer. He is credited with making influential and important mathematical discoveries, such as graph theory and infinitesimal calculus. Widely regarded as one of the greatest and most prolific mathematicians of all time, Leonhard Euler also made pioneering contributions to analytic number theory and topology.
3 Grigori Perelman(Mathematician)
4 Georg Cantor(Mathematician)
5 Peter Kropotkin(Anarchist, Socialist & Historian)
Russian philosopher Peter Kropotkin was a passionate advocate of anarcho-communism. He was also an activist, revolutionary, economist, and sociologist. He was arrested and imprisoned for his activism in 1874. However, he managed to escape and lived in exile for over 40 years in different countries across Europe. He returned to Russia after the Russian Revolution in 1917.
6 Lev Landau(Physicist)
Nobel Prize-winning Russian physicist Lev Landau is remembered for his pathbreaking research in quantum mechanics. A math prodigy, he had learned calculus at 13. He failed to receive his Nobel in person due to a near-fatal car crash which caused him injuries that eventually caused his death 6 years later.
7 Andrei Sakharov(Nuclear physicist)
Andrei Sakharov was a Russian dissident and nuclear physicist best remembered for designing RDS-37, Soviet Union's first two-stage hydrogen bomb. Also an activist for peace and human rights, Andrei Sakharov was honored with the Nobel Peace Prize in 1975. The Sakharov Prize for Freedom of Thought, which is awarded by the European Parliament, is named in his honor.
8 Anatoli Bugorski(physicist, nuclear scientist)

9 Sergei Korolev(Scientist)

Sergei Korolev was a Soviet spacecraft designer and rocket engineer who played an important role during the Space Race between the Soviet Union and the United States of America in the 1950s and 1960s. He was largely responsible for developing the R-7 Rocket and launching Yuri Gagarin into space. Sergei Korolev also launched Belka, Strelka, and Laika into space.
10 Vitalik Buterin(Computer scientist)

11 Andre Geim(Physicist)

Andre Geim is a Russian-born Dutch-British physicist. He has been associated with the School of Physics and Astronomy at the University of Manchester for several years. In 2010, he was awarded the Nobel Prize in Physics jointly with Konstantin Novoselov in recognition of his work on graphene. He is also a recipient of the 2000 Ig Nobel Prize in Physics.
12 Aleksandr Borodin(Composer, Chemist)
Aleksandr Borodin was a Russian musical composer. He was one of the popular 19th-century group of musicians known as The Five, who worked together to create a national style of classical music. A chemist and doctor by profession, Borodin also made important contributions to organic chemistry. His best known work as a chemist is his work pertaining to organic synthesis.
13 Konstantin Tsiolkovsky(Aerospace engineer, Rocket Scientist)
Konstantin Tsiolkovsky was a Russian rocket scientist. Credited with pioneering astronautic theory, Tsiolkovsky is widely regarded as one of the founding fathers of astronautics and modern rocketry. His works served as an inspiration to several other Soviet rocket engineers like Valentin Glushko and Sergei Korolev. Hence, Konstantin Tsiolkovsky's work played an influential role in the Soviet space program.
14 Trofim Lysenko(Experimenter)
Trofim Lysenko was a Soviet biologist and agronomist. Lysenko was one of the most influential supporters of Lamarckism. He also condemned Mendelian genetics and supported Lysenkoism, a political campaign that rejected natural selection. Lysenko used his political power to imprison his critics. Several Soviet scientists, including Nikolai Vavilov, who failed to renounce genetics were either imprisoned or killed.
15 Alexey Pazhitnov(Video game designer)

16 Vladimir Demikhov(Organ Transplant Pioneer)
17 Mikhail Lomonosov(Scientist, Polymath, Writer)
Russian polymath Mikhail Lomonosov was born to a fisherman father and left his village later to satiate his hunger for knowledge. Apart from reforming Russian language and literature, he also made the first colored glass mosaic in his country and discovered the atmosphere of Venus. He loved simple life.
18 Boris Nemtsov(Physicist)

Boris Nemtsov was a Russian liberal politician and physicist. He served as the Deputy Prime Minister of Russia in 1998. A fierce critic of Vladimir Putin, Nemtsov claimed that Putin's government was becoming increasingly authoritarian. Nemtsov was murdered in 2015 in Moscow. Interestingly, Boris Nemtsov expressed fear that Vladimir Putin would hire men to kill him weeks before his assassination.
19 Nikolai Lobachevsky(Mathematician)

20 Sergei Mikhailovich Prokudin-Gorskii(Chemist)

Sergei Mikhailovich Prokudin-Gorskii was a photographer and chemist of the Russian Empire. Prokudin-Gorskii is remembered for his effort to capture early 20th-century Russia and his groundbreaking work in color photography. From 1909 to 1915, Prokudin-Gorskii traveled across the Russian Empire, documenting several of its aspects. After his death, many of his negatives were taken to the U.S. Library of Congress.
21 Marina Oswald(Pharmacist)

Marina Oswald is a Russian-born American pharmacist best known as the widow of Lee Harvey Oswald, who killed the 35th president of the USA, John F. Kennedy. She played a key role in the Warren Commission hearings where she testified against Oswald. Marina has been portrayed by many actresses in films like JFK and Fatal Deception: Mrs. Lee Harvey Oswald.
22 George Gamow(Physicist)
Born to school teacher parents, Ukrainian-American physicist George Gamow grew up to be a pioneer of the big-bang theory. His other contributions include the liquid-drop model of atomic nuclei and his research on DNA. Apart from various science textbooks, he also wrote the popular Mr. Tompkins series of physics books.
23 Andrey Markov(Mathematician)

24 Ilya Prigogine(Chemist)
Ilya Prigogine was a physical chemist remembered for his work on irreversibility, complex systems, and dissipative structures. A respected member of several scientific organizations, Prigogine was honored with the Francqui Prize in 1955. In 1976, he won the Rumford Medal for his work concerning irreversible thermodynamics. His work on irreversible thermodynamics earned him the Nobel Prize in Chemistry in 1977.
25 Alexander Stepanovich Popov(Physicist)

Alexander Stepanovich Popov was a Russian physicist best remembered for his pioneering work in transmitting radio signals. One of the first inventors to come up with a radio receiving device, Popov's work was contemporaneous with the groundbreaking work of Italian inventor Guglielmo Marconi. Popov's life and career inspired the 1949 biographical film Alexander Popov which was directed by Herbert Rappaport.
26 Igor Kurchatov(Nuclear physicist)

27 Andrey Kolmogorov(Mathematician)
Russian mathematician Andrey Kolmogorov lost his mother at birth and was raised by his aunts. His talent in mathematics was discovered when he joined the Moscow State University to study history and math, while simultaneously studying metallurgy elsewhere. His greatest contribution to mathematics was in the field of probability theory.
28 Élie Metchnikoff(Former zoologist best known for his pioneering research in immunology)

29 Pafnuty Chebyshev(Considered to Be the Founding Father of Russian Mathematics)

30 Nikolai Vavilov(Former agronomist, botanist and geneticist best known for having identified the centers of origin of cultivated plants)

31 Yuri Oganessian(Nuclear physicist known for co-discoverer of the heaviest elements in the periodic table; element oganesson named after him)

32 Konstantin Novoselov(Physicist)

Konstantin Novoselov is a Russian-British physicist, currently serving as a professor at the Centre for Advanced 2D Materials, National University of Singapore. He is the Langworthy Professor in the School of Physics and Astronomy at the University of Manchester as well. Along with Andre Geim, he jointly received the Nobel Prize in Physics in 2010.
33 Pyotr Kapitsa(Physicist)
Nobel Prize-winning Soviet physicist Pyotr Kapitsa revolutionized science with his invention of new machines for liquefaction of gases. He is also remembered for discovering that liquid helium is superfluid. He had also served in World War I and had lost his father, wife, and children in the 1918-1919 flu epidemic.
34 Aleksandr Lyapunov(mathematician, physicist)

35 Zhores Ivanovich Alferov(Physicist)
Zhores Ivanovich Alferov was a Soviet and Russian academic and physicist whose work, which led to the formation of semiconductor heterostructures, earned him the 2000 Nobel Prize in Physics. Alferov's work helped revolutionize semiconductor design, which in turn played a major role in the development of satellite communications and mobile phones.
36 Leonid Kantorovich(Mathematician)
Leonid Kantorovich was a Soviet economist and mathematician. Credited with founding linear programming, Kantorovich was honored with the prestigious Stalin Prize in 1949. In 1975, he won the Nobel Memorial Prize in Economic Sciences for his work on the theory of optimum allocation of resources. He also made important contributions to functional analysis, operator theory, and approximation theory.
37 Sergei Winogradsky(Microbiologist)

38 Vladimir Vernadsky(Mineralogist)
Vladimir Vernadsky was a geochemist and mineralogist who is widely regarded as one of the founders of radiogeology, biogeochemistry, and geochemistry. He is also credited with founding the Ukrainian Academy of Sciences. Vernadsky is best remembered for his book, The Biosphere, which discusses Eduard Suess' work. He won the prestigious Stalin Prize in 1943.
39 Vladimir Voevodsky(Mathematician)

40 Alexander Oparin(Former Biochemist known for contributions to the theory of the origin of life, oacervates)

41 Dmitri Ivanovsky(Botanist)

Best remembered for his co-discovery of viruses during his research on the mosaic disease in tobacco, Russian botanist Dmitri Ivanovsky is regarded as one of the pioneers of virology. Interestingly, following his discovery, he didn’t focus on virology much and taught plant anatomy and physiology instead.
42 Alexander Friedmann(Physicist)

Though born to a ballet dancer father and a pianist mother, Alexander Friedmann grew up to be a talented mathematician and cosmologist. He had served as an aviator during World War I and later also taught. He died of typhoid at age 37 after eating a pear during his honeymoon.
43 Yury Luzhkov(Politician, Scientist)

44 Israel Gelfand(Mathematician)

45 Vladimir Arnold(Mathematician)

46 Petr Mitrichev(Computer scientist)

47 Maxim Kontsevich(Mathematician, Topologist)

48 Alexei Alexeyevich Abrikosov(Physicist)

Alexei Alexeyevich Abrikosov was a theoretical physicist who contributed immensely to the field of condensed matter physics. In 2003, Abrikosov received the prestigious Nobel Prize in Physics which he shared with Anthony James Leggett and Vitaly Ginzburg. Alexei Alexeyevich Abrikosov was also the recipient of the Lenin Prize, the USSR State Prize, and the Landau Prize.
49 Pavel Florensky(Theologian)

Russian theologian Pavel Florensky is best remembered for his essay The Pillar and the Ground of Truth. During Stalin’s regime and amid a phase of national atheism, he was sent to jail and also banished to Siberia for his religious beliefs, which he refused to renounce.
50 Pavel Cherenkov(Physicist)
Pavel Cherenkov was a Soviet physicist whose discovery of Cherenkov radiation in 1934 earned him the prestigious Nobel Prize in physics in 1958. He also played an important role in the investigation of photo-meson reactions and photo-nuclear and in the construction and development of electron accelerators. Over the course of his career, Cherenkov won several awards, including two Stalin Prizes.