RHS
RHS may stand for:
Education
United Kingdom
- Royal Hospital School, an independent naval school at Holbrook, Suffolk
 - Royal Historical Society
 
United States
- Radnor High School, a public high school in Radnor, Pennsylvania
 - Ralston High School
 - Reepham High School
 - Redlands High School, a public high school in Redlands, California
 - Reno High School, a public high school serving the city of Reno, Nevada located in Washoe County.
 - Richmond High School (Richmond, California)
 - Richmond Secondary School
 - Ridgeline High School (Utah), a public high school in Millville, Utah
 - Ridgeline High School (Washington), a public high school in Liberty Lake, Washington
 - Riverview High School (Riverview, Florida)
 - Robbinsville High School (New Jersey)
 - Robbinsville High School (North Carolina)
 - Roosevelt High School (disambiguation)
 - Rosepine High School
 
Other
- Ramsay Hunt syndrome, several medical conditions
 - Rectangular hollow section, a type of metal profile
 - Retired husband syndrome
 - Revue d'histoire de la Shoah, an academic journal about the Holocaust (Shoah) published in France
 - Right-hand side of an equation
 - Royal Horticultural Society
 - Rural Housing Service, in the USDA Rural Development Agency
 - Right angle, hypotenuse and side, indicating a congruent triangle
 - Rabbi Hershel Schachter, Rosh Yeshiva and Posek