NRR

NRR may refer to:

Club

 * Newport Reading Room, a gentlemen's club in Newport, Rhode Island

Electronic mail

 * No Reply Required in the subject field of an email

Law and regulation

 * 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

 * Net reproduction rate in human fertility
 * Nitrogen reduction reaction, the conversion of N2 to ammonia
 * Noise reduction ratings in hearing protectors

Music

 * National Rock Review, an American website for rock music reviews and interviews

Sport

 * Net run rate in cricket

Places

 * IATA code of José Aponte de la Torre Airport in Ceiba, Puerto Rico