Gilby is a surname. Notable people with the surname include:
- Anthony Gilby (c.1510–1585), English clergyman
- Fred Gilby (1907–1991), Australian rules footballer
- Harry Gilby, English actor
- Helen Gilby (born 1974), British sprint canoer
- John Gilby (1900–1985), New Zealand rower
- William Gilby (1834–1905), English cricketer
See also
- Gilby Engineering, motor racing team
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