Lewis Township is a township in Lycoming County, Pennsylvania, United States. The population was 987 at the 2010 census, down from 1,139 in 2000. It is part of the Williamsport Metropolitan Statistical Area.

U.S. Route 15 (US 15) is United States Numbered Highway that runs from Walterboro, South Carolina, north to Painted Post, New York. In Pennsylvania, the highway runs for 194.89 miles (313.65 km), from the Maryland state line just south of Gettysburg, north to the New York state line near Lawrenceville.