R.E. Mountain Secondary is a public high school in northern Langley, British Columbia and is a part of School District 35 Langley. It officially opened in 1977 and is built on the same plan as Brookswood Secondary School and Poppy Secondary School, with modifications to the South and North wings and an incomplete courtyard layout. As of the 2013-2014 school year, along with the main building there were 16 portable classrooms added to the campus due to overcrowding.