RCHS
- Railway and Canal Historical Society
- Raleigh Charter High School
- Rancho Cotate High School
- Rancho Cucamonga High School
- Rappahannock County High School
- Reed-Custer High School
- Rensselaer Central High School
- Richland Collegiate High School
- Richmond Community High School
- Rochester Community High School
- Rock Canyon High School
- Rockdale County High School
- Roman Catholic High School for Boys
- Roselle Catholic High School
- Royal Caledonian Horticultural Society
- Rushville Consolidated High School
- Thomas E. Edwards, Sr. High School