Martin Fleischmann (born 29 March 1927) is a British chemist noted for his work in electrochemistry. He came to wider public prominence following his controversial publication of work with colleague Stanley Pons on cold fusion using palladium in the 1980s and '90s.

Born in Karlovy Vary, Czechoslovakia, Fleischmann moved to England in 1938 with his family. He received a PhD from Imperial College London in 1950.

Fleischmann went on to teach at King's College, Durham University, which in 1963 became the newly established University of Newcastle upon Tyne. In 1967, aged 40, Fleischmann became Professor of Electrochemistry at the University of Southampton. From 1970 to 1972, he was president of the International Society of Electrochemists. In 1974, he played an important role in the discovery of Surface Enhanced Raman Scattering effect (SERS), and he developed the ultramicroelectrode in the 1980s. In 1979, he was awarded the medal for electrochemistry and thermodynamics by the Royal Society of London. In 1982 he retired from the University of Southampton. In 1985 he received the Palladium Medal from the US Electrochemical Society, and in 1986 was elected to the Fellowship of the Royal Society. He retired from teaching in 1983 and was given an honorary professorship at Southampton University.