Alexander Mikhajlovich Baldin (Russian: Александр Михайлович Балдин) (February 26, 1926, Moscow — April 29, 2001) was a Russian Soviet physicist, expert in the field of physics of elementary particles and high energy physics.
After finishing the railway technical school, he studied in the Moscow Institute of Engineers and Transport, followed by a DSc program in Moscow Engineering Physics Institute completing in 1949, when he became a professor in Lebedev Physical Institute. In 1968, he was named the director of Laboratory of High Energy Physics in the Institute for Nuclear Research (ОИЯИ) in Dubna, where the Soviet nuclear weapons were developed. He was elected a member of Russian Academy of Science and a faculty of Moscow State University. He was the co-designer of the project of synchrophasotron ОИЯИ (1949). He received the Order of Lenin (1988).