Lilly is a borough in Cambria County, Pennsylvania, United States. It is part of the Johnstown, Pennsylvania Metropolitan Statistical Area. The population was 948 at the 2000 census.
Lilly is located at 40°25′30″N 78°37′14″W / 40.425°N 78.62056°W / 40.425; -78.62056 (40.425000, -78.620434).
According to the United States Census Bureau, the borough has a total area of 0.5 square miles (1.3 km²), all of it land.