| Diana Shelstad | |
| Birth Place: | Sydney, Australia |
| Nationality: | Australian |
| Fields: | Mathematics |
| Workplaces: | Rutgers University–Newark |
| Alma Mater: | Yale University |
| Doctoral Advisor: | Robert Langlands |
| Known For: | Coconjecturing the fundamental lemma |
Diana Frost Shelstad (born August 19, 1947 in Sydney) is a mathematician known for her work in automorphic forms. She is a professor at Rutgers University–Newark. She earned her doctorate at Yale University in 1974 studying real reductive algebraic groups.
Shelstad has been a key player in the development of the theory of endoscopy which is part of Langlands program. She co-conjectured the fundamental lemma with Robert Langlands in 1984. After over 20 years, this conjecture was solved by Ngô Bảo Châu in 2009, thus opening up a wealth of consequences.
In 1999, Shelstad developed a theory of twisted endoscopy with Robert Kottwitz. In 2008–9 she completed work on tempered endoscopy.
In 2012 she became a fellow of the American Mathematical Society.
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