Isaac (Isaak) Oskarovich Lipnitsky (Lipnitski) (Russian: Исаак Оскарович Липницкий; 25 June 1923 – 25 March 1959) was a Ukrainian-Soviet chess master. He was a two-time Ukrainian champion (1949, 1956), and was among Ukraine's top half-dozen players from 1948 to 1956. He was a chess theoretician and professional teacher.