Glenside is a census-designated place (CDP) in Abington, Cheltenham, and Springfield townships, Montgomery County, Pennsylvania, United States. The population was 8,384 at the 2010 census. Glenside is located just under 2 miles from the Philadelphia city line, and about 11 miles from Center City Philadelphia.
Glenside is located at 40°6′11″N 75°9′8″W / 40.10306°N 75.15222°W / 40.10306; -75.15222 (40.102960, -75.152264).
According to the United States Census Bureau, the CDP has a total area of 1.3 square miles (3.4 km2), all of it land.