"Ernst Fischer" may refer to:

* Ernst Fischer (composer) (1900–1975), German composer and keyboard player

* Ernst Fischer (writer) (1899–1972), Austrian journalist, writer and politician

* Ernst Otto Fischer (1918–2007), German chemist, Nobel prize winner

* Ernst Gottfried Fischer (1754–1831), German chemist developer of stoichiometry theory together with Jeremias Richter

* Kuno Fischer (Ernst Kuno Berthold Fischer, 1824–1907), German philosopher

* Ernst Sigismund Fischer (1875–1954), Austrian mathematician

* Ernst Peter Fischer (born 1947), German historian of science, and science publicist

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