Harriton High School is a public secondary school located in Rosemont, Lower Merion Township, in Philadelphia's Main Line suburbs, USA. Harriton is one of two high schools in the Lower Merion School District; the other is Lower Merion High School. Originally, Harriton was the smaller of the high schools, containing approximately 900 students in 9th through 12th grades. After redistricting, the schools are now comparable in size, with Harriton having more than 1,200 students.