William Nunn Lipscomb, Jr. (born December 9, 1919) is an American inorganic chemist, working in experimental and theoretical chemistry and biochemistry.
He went on to earn his Doctor of Philosophy degree in Chemistry from the California Institute of Technology in 1946.

From 1946 to 1959 he taught at the University of Minnesota. Since 1959, he has been a professor of chemistry at Harvard University.
Lipscomb was elected to the National Academy of Sciences in 1961, and awarded the Nobel Prize in Chemistry in 1976. Professor Lipscomb is a member of the Honorable Order of Kentucky Colonels.
Lipscomb, along with several other Nobel laureates, is a regular presenter at the annual Ig Nobel Awards Ceremony, most recently doing so on September 30, 2010.