Grundy is a surname. Notable people with the surname include:
Felix Grundy (1777–1840), U.S. politician
Edward Grundy (1795–1875), politician and editor in South Australia.
Sydney Grundy (1848–1914), English dramatist
Joseph R. Grundy (1863–1961), American industrialist and politician
Patrick Michael Grundy (1917–1959; a.k.a. P. M. Grundy), mathematician known for the Sprague-Grundy theorem
Bill Grundy (1923–1993), British television presenter in the 1970s
Paul Grundy (engineer) (1935–2013), Australian engineer
Reg Grundy (1923–2016), Australian television producer
Hugh Grundy (1945), English drummer (The Zombies)
Stephan Grundy (1967), American author of saga retellings
Rebecca Grundy (1990), English cricketer
