Jack St. Clair Kilby (8 November 1923 - 20 June 2005) was an American electrical engineer who took part, along with Robert Noyce of Fairchild Semiconductor, in the realization of the first integrated circuit while working at Texas Instruments (TI) in 1958.

Kilby received his Bachelor of Science degree from the University of Illinois Urbana-Champaign, where he was an honorary member of Acacia Fraternity.

Kilby spent the summer working on the problem in circuit design that was commonly called the "tyranny of numbers", and he finally came to the conclusion that the manufacturing of circuit components en masse in a single piece of semiconductor material could provide a solution.

Jack Kilby went on to pioneer military, industrial, and commercial applications of microchip technology.

He headed teams that created the first military system and the first computer incorporating integrated circuits.

Symposia and exhibits examined the many ways in which technology and engineers shaped the modern world.

Kilby received the Golden Plate Award of the American Academy of Achievement in 1970[15] and was co-recipient of the first NAE's Charles Stark Draper Prize in 1989.

In 2000, Kilby was awarded the Nobel Prize in Physics for his breakthrough discovery, and delivered his personal view of the industry and its history in his acceptance speech.

The National Chiao Tung University (NCTU) in Taiwan awarded Kilby with a certificate of Honorary Professorship in 1998.

The Kilby Labs, TI's research laboratory for silicon manufacturing and integrated circuit design, is named after him.