RR or rr may refer to:
RR Donnelley is a Fortune 500 integrated communications company that provides marketing and business communications, commercial printing, and related services.
RRS Discovery was the last traditional wooden three-masted ship to be built in Britain. Designed for Antarctic research, it was launched as a Royal Research Ship (RRS) in 1901. Its first mission was the British National Antarctic Expedition, carrying Robert Falcon Scott and Ernest Shackleton on their first, successful journey to the Antarctic, known as the Discovery Expedition.
RRS Sir David Attenborough is the name given to a new research vessel owned by the Natural Environment Research Council, to be operated by the British Antarctic Survey for the purposes of both research and logistic support.
RRDtool (round-robin database tool) aims to handle time series data such as network bandwidth, temperatures or CPU load.
RR Auction is an auction house headquartered in Boston’s North End with a production office based in Amherst, New Hampshire.
RREUSE (Reuse and Recycling Social Enterprises in the European Union) is a European non-governmental organisation (NGO) and the first European umbrella organisation of social enterprises with activities in the reuse, repair and recycling sector.
Ribonucleoside-diphosphate reductase subunit M2 B is an enzyme that in humans is encoded by the RRM2B gene.
RR Lyrae is a variable star in the Lyra constellation, located near the border with the neighboring constellation of Cygnus.