The Heirtzler Fracture Zone (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.

Map centred on Heirtzler Fracture Zone's (purple) approximate surface projection on Pacific Ocean showing other nearby named fracture zones (orange). Associated features to fracture zones (lighter orange) and East Pacific Rise (white) are also shown. Click to expand to interactive map.^[1]

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.^[2]