NRR may refer to:
Club edit
- Newport Reading Room, a gentlemen's club in Newport, Rhode Island
Electronic mail edit
- No Reply Required in the subject field of an email
Law and regulation edit
- National Recording Registry in the United States
- Non-Repudiation of receipt, a legal acknowledgement of origination/authorship of a document (as per internet RFC4130)
- Office of Nuclear Reactor Regulation in the United States
Medicine/science edit
- Net reproduction rate in human fertility
- Nitrogen reduction reaction, the conversion of N2 to ammonia
- Noise reduction ratings in hearing protectors
Music edit
- National Rock Review, an American website for rock music reviews and interviews
Sports edit
- Net run rate in cricket
Places edit
- IATA code of José Aponte de la Torre Airport in Ceiba, Puerto Rico