Dr. George Harry Heilmeier (May 22, 1936 - ) is a notable American engineer and businessman, perhaps best known for his pioneering contributions to liquid crystal displays.

Heilmeier was born in Philadelphia, Pennsylvania, received his BS in Electrical Engineering from the University of Pennsylvania in Philadelphia, and his M.S.E., M.A., and Ph.D. degrees in solid state materials and electronics from Princeton University.

In 1958 Heilmeier joined RCA Laboratories in Princeton, New Jersey, where he worked on parametric amplification, tunnel diode down-converters, millimeter wave generation, ferroelectric thin film devices, organic semiconductors and electro-optic effects in molecular and liquid crystals. In 1964 he discovered several new electro-optic effects in liquid crystals, which led to the first working liquid crystal displays based on what he called the dynamic scattering mode (DSM).

Heilmeier spent much of the 1970s in the United States Department of Defense. From 1970-71 he served as a White House Fellow and special assistant to the Secretary of Defense, performing long-range research and development planning. In 1971 he was appointed Assistant Director for Defense Research and Engineering, Electronic and Physical Sciences, overseeing all research and exploratory development in electronics and the physical sciences. In 1975 he was named Director of the Defense Advanced Research Projects Agency (DARPA) and initiated major efforts in stealth aircraft, space-based lasers, space-based infrared technology, and artificial intelligence.

In December 1977 Heilmeier left government to become vice president at Texas Instruments; in 1983 he was promoted to Chief Technical Officer. From 1991-1996 he was president and CEO of Bellcore (now Telcordia), ultimately overseeing its sale to Science Applications International Corporation (SAIC). He served as the company's chairman and CEO from 1996-1997, and afterwards as its chairman emeritus.

Heilmeier has received numerous awards, holds 15 patents, and is a member of the National Academy of Engineering, the Defense Science Board, and the National Security Agency Advisory Board. He serves on the board of trustees of Fidelity Investments and of Teletech Holdings, and the Board of Overseers of the School of Engineering and Applied Science of the University of Pennsylvania.