Allegro Valley (71°18′S160°10′E) is a steep-sided, glacier-filled valley indenting the east side of Daniels Range just north of White Spur, in the Usarp Mountains, Antarctica. The northern party of the New Zealand Geological Survey Antarctic Expedition, 1963–64, experienced fine weather here after several days of unpleasant travel; therefore, the expedition members named it after John Milton's poem L'Allegro in antithesis to Penseroso Bluff, 14 miles (23 km) to the north.