Jan Rusinek (born 2 December 1950) is a Polish mathematician and chess composer, particularly noted for his brilliant endgame studies.
He was editor of the study section of Szachy (Chess) from 1971 to the magazine's closure in 1990.
Rusinek became an International Judge of chess composition in 1983, and a Grandmaster of chess composition in 1992.
He won over 30 first prizes in composing tourneys.
The Oxford Companion to Chess opines that "his achievements are likely to rival those of his greatest predecessors".