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
Business
edit- Customer retention#NRR: Net Revenue Retention
Sport
edit- Net run rate in cricket
Places
edit- IATA code of José Aponte de la Torre Airport in Ceiba, Puerto Rico