Ernst Otto Fischer (November 10, 1918–July 23, 2007) was a German chemist who won the Nobel Prize for pioneering work in the area of organometallic chemistry in 1973.

Fischer worked on his doctoral thesis as an assistant to Professor Walter Hieber in the Inorganic Chemistry Institute,
He was appointed a lecturer at the TU in 1955 and, in 1957, professor and then, in 1959, C4 professor. In 1964 he took the Chair of Inorganic Chemistry at the TU.
In 1964, he was elected a member of the Mathematics/Natural Science section of the Bavarian Academy of Sciences.
In 1969 he was appointed a member of the German Academy of Natural Scientists, Leopoldina and in 1972 was given an honorary doctorate by the Faculty of Chemistry and Pharmacy of the University of Munich.
He died on July 23, 2007 in Munich.