Easterby is a surname. Notable people with the surname include:
Guy Easterby (born 1971), Irish rugby union player Jack Easterby (born 1983), American football executive Mick Easterby (born 1931), British racehorse trainer Peter Easterby (1929–2025), British racehorse trainer Simon Easterby (born 1975), Irish rugby union player Tim Easterby (born 1961), British racehorse trainer