Leon Iosifovich Kordysh (22.07.1878 — 11.07.1932) was a Soviet theoretical physicist. He was born in Kiev. He graduated from Kiev University (1900). He worked, with interruptions, at Kiev University (professor from 1917) and at the Kiev Polytechnic Institute (professor from 1922). From 1927 he also headed the theoretical physics section of the Kiev Research Chair of Physics, and after its transformation in 1929 into the Research Institute of Physics (now the Institute of Physics of the Academy of Sciences of the Ukrainian SSR) he headed the theoretical department of that institute.
His work was in the fields of mechanics, acoustics, spectroscopy, atomic physics, thermodynamics, quantum theory, relativity and quantum mechanics.