Jack St. Clair Kilby (born 1923) is a notable American electrical engineer. He invented the integrated circuit in 1958 while working at Texas Instruments. At about the same time Robert Noyce made the same discovery at Fairchild Semiconductor.

Born in Jefferson City, Missouri, he received his undergraduate (BS) degree from University of Illinois at Urbana Champaign in 1947 with a degree in Electrical Engineering.

From 1978 to 1985, he was Distinguished Professor of Electrical Engineering at Texas A&M University.

He was awarded the Nobel Prize in Physics in 2000 for his breakthrough discovery.