Grunsky is a Russian surname. Notable people with the surname include:
Carl E. Grunsky (1855–1934), American geologist and civil engineer Donald L. Grunsky (1915-2000), American politician Eric Grunsky, Canadian scientist Helmut Grunsky (1904–1986), German mathematician Jack Grunsky (born 1945), Canadian singer-songwriter Matthias Grunsky (born 1971), Austrian cinematographer