Horsham Township is a home rule municipality in Montgomery County, Pennsylvania. It is located ten miles north of Center City Philadelphia. The township, incorporated in 1717, is one of the oldest original municipalities in Montgomery County. Although it retains the word "Township" in its official name, it has been governed by a Home Rule Charter since 1975 and is therefore not subject to the Pennsylvania Township Code. The population was 26,564 at the time of the 2020 census.

Montgomery County, colloquially referred to as Montco, is a county in the Commonwealth of Pennsylvania. As of the 2020 census, the population of the county was 856,553, making it the third-most populous county in Pennsylvania after Philadelphia and Allegheny counties. The county is part of the Southeast Pennsylvania region of the state.