Sidney Redner (born 1951) is a Canadian-born physicist, professor, and a resident faculty member at the Santa Fe Institute. He was formerly department chair of physics at Boston University. Redner has published over 200 journal articles, authored a book titled A Guide to First-Passage Processes (2001, ISBN 0-521-65248-0), and coauthored a book titled A Kinetic View of Statistical Physics (2010, ISBN 978-0-521-85103-9) with Pavel L. Krapivsky and Eli Ben-Naim. His research focuses mainly on non-equilibrium statistical mechanics and network structure. He received his Ph.D. in physics from the Massachusetts Institute of Technology in 1977 under Gene Stanley, also on faculty at Boston University.^[1]

He was awarded the American Physical Society's Leo P. Kadanoff Prize for 2021.^[2]