Newby is a village and civil parish in the Westmorland and Furness district of the county of Cumbria, England. It is about 7 miles (11 km) from the large town of Penrith and about 5 miles (8 km) from the small town of Appleby-in-Westmorland, and has a population of 164. Nearby is Newby Beck. Newby has a post office. The population at the 2011 Census was less than 100 and data was included with Sleagill.