Martiny is a surname. Notable people with the surname include:
Constant Martiny (1888–1942), Belgian intelligence agent Danny Martiny (born 1951), American politician and attorney Donald Martiny (born 1953), American artist Erik Martiny (born 1971), Franco-Irish-Swedish novelist, academic and journalist Jennifer Martiny, American ecologist Marie Deluil-Martiny (1841–1884), French nun Philip Martiny (1858–1927), Franco-American sculptor