Re

Re or RE may refer to:

Arts, media and entertainment

...Re, a 2016 Indian Kannada-language film
Realencyclopädie der classischen Altertumswissenschaft, a German encyclopedia of classical scholarship
Royal Society of Painter-Printmakers, whose fellows may use the Post-nominal letters RE
"Re;", the series finale of season 2 of Code Geass

Re, the second syllable of the scale in solfège; maps to D in traditional fixed do
Rishabha (svara), the long form of the syllable रे (Re), and the second of the seven svaras in Hindustani and Carnatic music
Re: (band), a musical duo based in Canada and the US

More, re, and bre, interjections and/or vocative particles in Greek, Albanian, Turkish, and some Romance and Slavic languages
Re (kana), れ/レ, Japanese syllables
Re (Armenian), Ր/ր
Re or Ri (cuneiform),
RE: or Re:, a standard email subject line prefix

Re Municipality, a former municipality in Vestfold county
Re, Vestland, a village in Gloppen municipality, Vestland county, Norway
Re, Piedmont, an Italian municipality
Île de Ré, an island off the west coast of France
- Le Bois-Plage-en-Ré, a commune on that island
Re di Anfo, a torrent (seasonal stream) in Italy
Re di Gianico, Re di Niardo, Re di Sellero, and Re di Tredenus, torrents in the Val Camonica, Lombardy, Italy
Réunion (ISO 3166-1 code), a French overseas department and island in the Indian Ocean
Rewari Junction railway station (station code: RE), Haryana, India
Regional-Express, a type of regional train in Germany, Luxembourg and Austria
Aer Arann (1970–2014) or Stobart Air (2014–2021), by IATA code, a defunct regional airline based in Dublin, Ireland
Realpha, a 1960s Rhodesian Formula One racing car

Effective reproduction number, in epidemiology
Relative effectiveness or RE factor, of an explosive's demolition power
Reynolds number ( $Re$ ), a dimensionless quantity in fluid mechanics used to help predict flow patterns
Rhenium (symbol Re), a chemical element
Reference pressure (Re), as sound pressure level
Reference pressure (Re), in underwater acoustics
R_E, Earth radius

RE (complexity) (recursively enumerable), a complexity class of decision problems
- Recursively enumerable (r.e.), in computability theory
Regular expression, a sequence of characters to match text against a specified pattern
Re, the function from a complex number to its real part
.re, the Internet country code top-level domain for Réunion
RE (character set), short for HP Roman Extension