Kilby is both a surname and a given name. Notable people with the name include:
Surname: Arthur Forbes Gordon Kilby (1885–1915), English recipient of the Victoria Cross Barry Kilby, chairman of Burnley football club, England Brian Kilby (born 1938), British marathon runner Jack Kilby (1923–2005), American electrical engineer, inventor of the integrated circuit, and Nobel Laureate Richard Kilby (1560–1620), English scholar and priest Thomas Erby Kilby (1865–1943), Governor of Alabama, US Tommy Kilby (born 1964), American politician
Given name: Kilby MacDonald (1913–1986), hockey player Kilby Snow (1905–1980), American musician