RSD
- Game-Maker
- Julien Blanc
- Rahul Sharad Dravid
- Reading School District
- Really Simple Discovery
- Record Store Day
- Recovery School District
- Redshift-space distortions
- Reichssicherheitsdienst
- Rejection sensitive dysphoria
- Relative standard deviation
- Remote sensing
- Rhinelander School District
- Rob Smith (British musician)
- Robust standard deviation
- Rochester City School District
- Rochester School for the Deaf
- Rock Sound International Airport
- Rockwood School District
- Roller shutter
- Roosevelt Elementary School District
- Royal School Dungannon
- Serbian dinar
- Social Democratic Rally