Abraham Plessner (February 13, 1900 – April 18, 1961) was a Russian mathematician. He was born on February 13, 1900, to a Jewish family in Łódź, which is now in Poland. He studied at secondary school where he was taught in Russian, German, and Polish. He studied at the University of Giessen where he studied under Ludwig Schlesinger and Friedrich Engel. He also studied at the University of Göttingen and Berlin. He completed his doctorate from the University of Giessen in 1922. Jointly with Kurt Hensel he edited Kronecker's collected works.