Lower Merion School District, or LMSD, is a public school district located in Montgomery County, Pennsylvania. The school district includes residents of both Lower Merion Township and the Borough of Narberth. Established in 1836, LMSD is one of the oldest districts in Pennsylvania. It is the wealthiest school district in the state, and one of the wealthiest school districts in the country.

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.