**Alexander Borisovich Zamolodchikov** (Russian: Алекса́ндр Бори́сович Замоло́дчиков; born September 18, 1952) is a Russian physicist, known for his contributions conformal field theory, and statistical mechanics, and subsequently string theory and condensed matter physics.

He is widely regarded as one the most accomplished Theoretical Physicist^{[1]} for his profound contribution to fundamentals of physics especially to Quantum Field Theories for which he was awarded the Breakthrough Prize in Fundamental Physics^{[1]} in 2024. He is currently the C.N. Yang – Wei Deng Endowed Chair of Physics at Stony Brook University.^{[2]}

Born in Novo-Ivankovo, now part of Dubna, Zamolodchikov earned a M.Sc. in nuclear engineering (1975) from Moscow Institute of Physics and Technology, a Ph.D. in physics from the Institute for Theoretical and Experimental Physics (1978). He joined the research staff of Landau Institute for Theoretical Physics (1978) where he got an honorary doctorate (1983).

He co-authored the famous BPZ paper "Infinite Conformal Symmetry in Two-Dimensional Quantum Field Theory",^{[3]} with Alexander Polyakov and Alexander Belavin.^{[3]}^{[4]}

He joined Rutgers University (1990) where he co-founded Rutgers New High Energy Theory Center, and was named Board of Governors Professor (2005).^{[5]}

In 2016, he became the inaugural holder of the C. N. Yang/Wei Deng Chair in the Department of Physics and Astronomy and C. N. Yang Institute for Theoretical Physics at Stony Brook University.^{[6]}

He is the twin brother of the late Alexei Zamolodchikov (1952–2007), also a noted physicist.^{[7]}

- 1999: Dannie Heineman Prize for Mathematical Physics with Barry M. McCoy and Tai Tsun Wu for "their groundbreaking and penetrating work on classical statistical mechanics, integrable models and conformal field theories."
- 2003/4: Humboldt Prize
- 2005: Blaise Pascal Chair at the École Normale Supérieure in Paris
- 2011: Lars Onsager Prize, together with Alexander Belavin and Alexander Polyakov, "for the remarkable ideas that they introduced concerning conformal field theory and soluble models of statistical mechanics in two dimensions."
- 2011: Dirac Medal from the International Center for Theoretical Physics, Trieste.
- 2016: elected to the National Academy of Sciences
^{[8]} - 2024: Breakthrough Prize in Fundamental Physics,
^{[9]}"for profound contributions to statistical physics and quantum field theory, with diverse and far-reaching applications in different branches of physics and mathematics."