The Heirtzler Fracture Zone (63°30′S 162°30′E / 63.500°S 162.500°E / -63.500; 162.500Coordinates: 63°30′S 162°30′E / 63.500°S 162.500°E / -63.500; 162.500) is an undersea fracture zone located south of New Zealand near Antarctica.

The feature was named for James R. Heirtzler, a geophysicist who was a pioneer in geomagnetics studies. The name was proposed by the Lamont–Doherty Geological Observatory (now the Lamont–Doherty Earth Observatory), and was approved by the Advisory Committee on Undersea Features in 1993.^[1]