Hartz is a surname, and may refer to:
- Harris Hartz (born 1947), U.S. federal judge
- Harry Hartz (1896—1974), U.S. racecar driver
- Jim Hartz (born 1940), U.S. television personality
- Louis Hartz (1919—1986), U.S. political scientist
- Nikolaj Hartz (1867—1937), Danish geologist and botanist
- Peter Hartz (born 1941), German business executive (Hartz concept)
- William J. Hartz, U.S. composer and lyricist
The corporate name may refer to:
- Hartz Mountain Industries, a real estate and pet product conglomerate