Mount Weller is a peak (2,420 m) rising above the west side of Beacon Valley, 4 nautical miles (7 km) southwest of Pyramid Mountain, in Quartermain Mountains, Victoria Land, Antarctica. It is also 90 miles (140 km) due west of McMurdo Station. The name appears to be first used on a 1961 New Zealand Lands and Survey Department map compiled from New Zealand field surveys, 1957–60, and U.S. Navy aerial photographs of that period. Presumably named after William J. Weller, Royal Navy, a seaman of the ship RSS Discovery. In November 1903, Weller and Thomas Kennar accompanied Hartley T. Ferrar in the first geological reconnaissance of Quartermain Mountains.