RNR is the Royal Naval Reserve, the volunteer reserve force of the Royal Navy in the United Kingdom.
RNR may also refer to:
- Ribonucleotide reductase
- Rig 'n' Roll, a truck simulation adventure game
- Right node raising, in linguistics, a mechanism that sees parallel structures share material to their immediate right
- Rock and roll, a genre of music
- Royal Newfoundland Regiment, a regiment of the Canadian Army
- "RnR", a franchise of the FGL Sports
- R n R, an album by Richard Elliot and Rick Braun
- the risk-need-responsivity model of offender treatment
- Rock'n'Reel, a music magazine