Gadsby is a surname. Notable people with the surname include:
- Bill Gadsby (1927âÂÂ2016), Canadian professional ice hockey player
- Ernie Gadsby (1884âÂÂ1963), English footballer
- Hannah Gadsby (born 1978), Australian actor and comedian
- Henry Gadsby (1842âÂÂ1907), English composer and organist
- Jon Gadsby (born 1953), New Zealand television comedian and writer
- Matt Gadsby (1979âÂÂ2006), English footballer
- Mick Gadsby (born 1947), English footballer
- Nyan Gadsby-Dolly, Trinidad and Tobago politician
- Walter Gadsby (born 1872), English footballer
- Walter Gadsby (1882âÂÂ1961), English footballer
- William Gadsby (1773âÂÂ1844), English hymn writer and Baptist pastor