Kazimierz Kordylewski (Polish pronunciation: [kaˈʑimjɛʂ kɔrdɨˈlɛfskʲi]; born 11 October 1903 – 11 March 1981) was a Polish astronomer. He is known for his discovery of the Kordylewski clouds, two clouds of dust concentrated at the Moon's L4 and L5 Lagrange points.