Rem
Rem or REM may refer to:

Music
R.E.M., an American rock band
R.E.M. (EP), by the band Green
"R.E.M." (song), by Ariana Grande

Science and technology
Rapid eye movement sleep, a phase of sleep
Roentgen equivalent man (rem), a unit of radiation dose equivalent
REM (BASIC), an inline comment (REMark) in BASIC and some other computer languages
Rare-earth metal
Reflection electron microscope
Reticular erythematous mucinosis, a skin disease
Root em, a font-size measurement used with Cascading Style Sheets
Real ear measurement, measurement of sound pressure level in a patient's ear canal developed when a hearing aid is worn
Random effects model, a statistical model

Organizations
La République En Marche!, a French centrist political party
Reichserziehungsministerium, in Nazi Germany, unofficially known as the Reich Education Ministry
Reiss Engelhorn Museum, Germany
Resource Extraction Monitoring, a UK-based non-profit organisation
Rosicrucian Egyptian Museum, California, United States
REM Island, an offshore platform and home of the pirate stations Radio and TV Noordzee

People
Jakob Rem (1546–1618), Austrian Jesuit
Rem Koolhaas (born 1944), Dutch architect
Rem Vyakhirev (1934–2013), Russian manager
Rem, pen name of Priscilla Hamby, illustrator and comic book artist

Fictional characters
Rem, an android in Logan's Run
Rem, in Dream Hunter Rem
Rem Saverem, in Trigun
Rem, in Bobobo-bo Bo-bobo
Rem (Death Note), a Shinigami in Death Note
Rem Kaginuki, a devil in Dance with Devils
Rem (Re:Zero), a character in the light novel/anime series Re:Zero − Starting Life in Another World
Rem Galleu, in How Not to Summon a Demon Lord

Other uses
Rém, a village in Hungary
Réseau express métropolitain, Greater Montreal rapid transit system
REM (Real Estate Magazine), Canada
Rem (mythology), an Egyptian fish god

See also
REM World, a fantasy/science fiction novel by Rodman Philbrick
Rems (disambiguation)