Rosemont is a community in Pennsylvania on the Pennsylvania Main Line lying partly in Radnor Township, Pennsylvania and partly in Lower Merion Township, Pennsylvania.
Part of the geographic area is served by the Bryn Mawr, Pennsylvania, ZIP code. Rosemont is served by its own stops on both the R5 SEPTA Regional Rail line and the Norristown High Speed Line.
The community of Garrett Hill is in Radnor Township and in the Rosemont section.
Rosemont is the town used by soap opera creator and writer Agnes Nixon as a model for the fictional town of Pine Valley, Pennsylvania, the setting for the popular daytime drama All My Children, which debuted on ABC in 1970.