| Stephenson Bastion | |
| Map: | Antarctica |
| Elevation M: | 1850 |
| Location: | Coats Land, Antarctica |
| Range: | Shackleton Range |
| Coordinates: | -80.7667°N -39°W |
Stephenson Bastion (-80.7667°N -39°W) is a mountain massif with steep rock cliffs on its south side, rising to in the south-central part of the Shackleton Range. It was first mapped in 1957 by the Commonwealth Trans-Antarctic Expedition, and it was photographed by U.S. Navy aircraft in 1967. It was named by the United Kingdom Antarctic Place-Names Committee (UK-APC) for Philip J. Stephenson, an Australian geologist with the transpolar party of the CTAE in 1956–58.
Features of the massif that are named on the 1983 United States Geological Survey map are (west to east):
See main article: Mount Greenfield. -80.7667°N -63°W. Ice-free mountain rising to and surmounting the west extremity of Stephenson Bastion in the Shackleton Range.Mapped in 1957 by the CTAE and named after George C. Greenfield, literary agent of the CTAE, 1955-58.
See main article: Clayton Ramparts. -80.7333°N -52°W. A line of east–west cliffs rising to over at the south margin of Fuchs Dome, Shackleton Range. Surveyed by the CTAE, 1957, photographed from the air by the U.S. Navy, 1967, and further surveyed by BAS, 1968-71. Named by the UK-APC after Charles A. Clayton, BAS surveyor, Halley Station, 1969-71, who worked in the area.
-80.8°N -68°W. Prominent rock bluff on the east side of Stephenson Bastion in the south-central part of the Shackleton Range. First visited by the CTAE in 1957 and given this descriptive name because of the feature's resemblance to the ram bow of an old battleship.