Re (disambiguation)

Re is an exclamation in Greek.

RE, the acronym, may mean:
* RE (complexity), the set of recursively enumerable languages
* Aer Arann, IATA code
* Rare earth, a type of chemical elements
* Real estate
* Recursively enumerable set
* Regular expression, in computer science, a string that describes or matches a set of strings, according to certain syntax rules
* Relative effectiveness factor, a measurement of an explosive's power
* Religious Education
* Renewable Energy
* Resident Evil (series), a franchise of horror-adventure video games, developed by Capcom
* Réunion, ISO 3166 digram and FIPS PUB 10-4 territory code
* Reverse engineering, the process of taking something (a device, an electrical component, a software program, etc.) apart and analyzing its workings in detail
* Requirements engineering during the development of computer programs
* Royal Engineers, a corps of the British Army
* Royal Society of Painter-Etchers and Engravers, since 1991 the Royal Society of Painter-Printmakers

Re, the proper noun, may mean:
* Re{z} or $Re$: the real part in mathematics
* Giovanni Battista Cardinal Re, an Italian priest
* Reynolds number, in physics
* Ra, an ancient Egyptian god/deity (alternate spelling)
* Re (album), by the Mexican band Café Tacuba
* Re (Les Rita Mitsouko album), a remix album by French duo Les Rita Mitsouko.
* Re, Norway, a municipality
* Re (VB), a village in the Italian province of Verbano Cusio Ossola
* Réaumur scale degree (°Ré)
* Reinsurance, as in Swiss Re or Fortress Re
* Rhenium, the chemical symbol for the element
* Rupee, a currency
* The second pitch of the solfege scale, corresponding to the note 'D'
* Île de Ré, an island off the Charente-Maritime département of France
* A romanisation of the Japanese kana れ and レ
* Re di Anfo, a torrent (a seasonal stream) in the Province of Brescia
* Re di Gianico, a torrent in the Valle Camonica
* Re di Niardo, a torrent in the Valle Camonica
* Re di Sellero, a torrent in the Valle Camonica
* Re di Tredenus, a torrent in the Valle Camonica

re, capitalized or not, may mean:
* The Latin phrase, "re", meaning " [in] the matter of". Used often in emails (e.g., "Re: Subject") to indicate a response to a previous subject
* Réunion, .re being its Internet country code top-level domain (ccTLD)