RCL
- RC Lens
- RLC circuit
- Radial collateral ligament of elbow joint
- Radial collateral ligament of thumb
- Radial collateral ligament of wrist joint
- Ramped Cargo Lighter
- Ramped Craft Logistic
- Ramsey County Library
- Recoilless rifle
- Reliance Capital
- Revised Common Lectionary
- Revolutionary Communist League (disambiguation)
- Robot Combat League
- Royal Canadian Legion
- Royal Caribbean Group
- Rugby Club Luxembourg