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

Sports

• Net run rate in cricket

Places

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

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