The Grosvenor Mountains (85°40′S 175°0′E / 85.667°S 175.000°E / -85.667; 175.000) are a group of widely scattered mountains and nunataks rising above the Antarctic polar plateau east of the head of Mill Glacier, extending from Mount Pratt in the north to the Mount Raymond area in the south, and from Otway Massif in the northwest to Larkman Nunatak in the southeast.

Several peaks near Mount Raymond were apparently observed by Ernest Shackleton in 1908, although they were then considered to be a continuation of the Dominion Range.

A prominent peak rising from Otway Massif, being the highest summit, 3,240 metres (10,630 ft) high, on the ridge bordering the west side of Burgess Glacier.

The most prominent mountain, 3,195 metres (10,482 ft) high, in the northeast part of Otway Massif, surmounting the north end of the ridge which borders the east side of Burgess Glacier.

A peak, 3,260 metres (10,700 ft) high, in eastern Otway Massif, 5 nautical miles (9.3 km; 5.8 mi) southeast of Mount Petlock.

A large, isolated mountain, 2,990 metres (9,810 ft) high, standing 10 nautical miles (19 km; 12 mi) southeast of Otway Massif.

A small rock nunatak, 2,785 metres (9,137 ft) high, standing 3 nautical miles (5.6 km; 3.5 mi) southwest of Mount Bumstead.

Prominent peak, 2,870 metres (9,420 ft) high, standing 2.5 nautical miles (4.6 km; 2.9 mi) northwest of Mount Raymond.

A rock peak, 2,820 metres (9,250 ft) high, standing on the southernmost ridge of the Grosvenor Mountains, 2.5 nautical miles (4.6 km; 2.9 mi) southeast of Mount Cecily.

The northernmost nunatak in the Grosvenor Mountains, standing just east of the head of Mill Stream Glacier, 17 nautical miles (31 km; 20 mi) north of Block Peak.

Discovered by R. Admiral Byrd on the ByrdAE flight to the South Pole in November 1929, and named by him for Thomas B. Pratt, American financier and contributor to the expedition.

A peak, 2,770 metres (9,090 ft) high, standing 4 nautical miles (7.4 km; 4.6 mi) northwest of Mauger Nunatak.

A nunatak, 2,780 metres (9,120 ft) high, about 3 nautical miles (5.6 km; 3.5 mi) northeast of Mount Block.