Gladwyne is a suburban community in Lower Merion Township, Montgomery County, Pennsylvania, United States along the historic Philadelphia Main Line. In 2018, Gladwyne was ranked the sixth richest ZIP Code in the country in a study by Bloomberg BusinessWeek. The population was 4,096 at the 2020 US census. As Gladwyne is neither an incorporated area nor a census-designated place, all data are for the ZIP Code 19035, with which the community is coterminous.

Lower Merion Township is a township in Montgomery County, Pennsylvania, United States. It is part of the Philadelphia Main Line. The township's name originates with the county of Merioneth in north Wales. Merioneth is an English-language transcription of the Welsh Meirionnydd.