Dunsby is a surname, mostly used in English-speaking countries. Notable people with the surname include:
Adam Dunsby (born 1967), American businessman, financier, and politician Brian Dunsby (1940–2025), British entrepreneur Jakob Dunsby (born 2000), Norwegian footballer Jonathan Dunsby (born 1953), British classical pianist, musicologist, author and translator Peter Dunsby (born 1966), South African cosmologist