John Bannister Goodenough ( ; July 25, 1922 – June 25, 2023) was an American materials scientist, a solid-state physicist, and a Nobel laureate in chemistry. From 1986 he was a professor of Mechanical, Materials Science, and Electrical Engineering at the University of Texas at Austin. He is credited with 
identifying the Goodenough–Kanamori rules of the sign of the magnetic superexchange in materials, with developing materials for computer random-access memory and with inventing cathode materials for  lithium-ion batteries.
Goodenough was born in Jena, Germany, to American parents. During and after graduating from Yale University, Goodenough served as a U.S. military meteorologist in World War II. He went on to obtain his Ph.D. in physics at the University of Chicago, became a researcher at MIT Lincoln Laboratory, and later the head of the Inorganic Chemistry Laboratory at the University of Oxford. 
Goodenough was awarded the National Medal of Science, the Copley Medal, the Fermi Award, the Draper Prize, and the Japan Prize. The John B. Goodenough Award in materials science is named for him. In 2019, he was awarded the Nobel Prize in Chemistry alongside M. Stanley Whittingham and Akira Yoshino; at 97 years old, he became the oldest Nobel laureate in history. From August 27, 2021, until his death, he was the oldest living Nobel Prize laureate.