Hartig is a German surname. Notable people with the surname include:
Hartig Drug, a chain of pharmacy retail stores based out of Dubuque, IowaFriedrich Hartig (1900–1980), an Italian entomologist who specialised in LepidopteraGeorg Ludwig Hartig (1764–1837), a German agriculturist and writer on forestryHeinz Friedrich Hartig (1907–1969), a German composer and harpsichordistLukáš Hartig (born 1976), a Czech football playerRobert Hartig (1839–1901), a German forestry scientist and mycologist, son of TheodorTheodor Hartig (1805–1880), a German forestry scientist and zoologist, son of Georg Ludwig