William P. Byers (born 1943) is a Canadian mathematician and philosopher; professor emeritus in mathematics and statistics at Concordia University in Montreal, Quebec, Canada.
He completed a BSc ('64), and an MSc ('65) from McGill University, and obtained his PhD ('69) from the University of California, Berkeley.
His area of interests include Dynamical Systems, and the Philosophy of Mathematics.
Byers has published in various mathematical journals and published some books. How Mathematicians Think and The Blind Spot, were both published by Princeton University Press. Byers' latest book, "Deep Thinking"  was published by World Scientific Publishing.