RHS
- Hershel Schachter
- Hollow structural section
- Left-hand side and right-hand side of an equation
- Radnor High School
- Ralston High School
- Ramsay Hunt syndrome
- Redlands High School
- Redmond High School (Oregon)
- Redmond High School (Washington)
- Reepham High School
- Renaissance High School
- Reno High School
- Retired husband syndrome
- Revue d'histoire de la Shoah
- Richmond High School (Richmond, California)
- Richmond Secondary School
- Ridgeline High School (Utah)
- Ridgeline High School (Washington)
- Riverview High School (Riverview, Florida)
- Rizal High School
- Robbinsville High School (New Jersey)
- Robbinsville High School (North Carolina)
- Roosevelt High School (disambiguation)
- Rosepine High School
- Royal Historical Society
- Royal Horticultural Society
- Royal Hospital School
- Rural Housing Service
- Washoe County, Nevada