Leo Mandelkern (23 February 1922 – 31 May 2006) was a polymer chemist and professor known for his contributions to the understanding of polymer crystallization, and for his contributions to education.
Mandelkern was born on February 23, 1922, in New York City. He was raised there, and attended public schools. He served as a meteorologist during World War II. He died on May 31, 2006.