Gert Sabidussi (28 October 1929 – 1 April 2022) was an Austrian mathematician specializing in combinatorics and graph theory.
His family later moved to Innsbruck, where his father was a Protestant deacon.
He graduated from the University of Vienna, where he attended lectures by Felix Ehrenhaft, Nikolaus Hofreiter, Johann Radon and Hans Thirring.
In 1953, he defended his doctorate on 0–1 matrices under the supervision of Edmund Hlawka and received a two-year fellowship at Princeton University.
He was instrumental in bringing to Canada a number of combinatorialists and graph theorists, including Anton Kotzig and Jaroslav Nešetřil, who wrote a thesis under Sabidussi.