Gadsby is a surname. Notable people with the surname include:

• Bill Gadsby (1927–2016), Canadian professional ice hockey player
• Ernie Gadsby (1884–1963), English footballer
• Hannah Gadsby (born 1978), Australian actor and comedian
• Jon Gadsby (born 1953), New Zealand television comedian and writer
• Matt Gadsby (1979–2006), English footballer
• Walter Gadsby, English footballer
• Walter Gadsby (footballer, born 1882) (1882–1961), English footballer
• William Gadsby (1773–1844), hymn writer and Baptist pastor

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