Re

Re or RE may refer to:

Arts and entertainment

Re, the second syllable of the scale in solfège
- Re, or D (musical note), the second note of the musical scale in fixed do solfège
Re: (band), a musical duo based in Canada and the United States

Re, Norway, a former municipality in Vestfold county, Norway
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

Effective reproduction number, in epidemiology
Religious education (RE), the study of religion
re (interjection), in Greek
Re (kana), the Japanese syllables written れ and レ
Re (Egyptian religion), an ancient Egyptian god also known as Ra
RE (complexity) (recursively enumerable), a complexity class of decision problems
Regional-Express, a type of regional train in Germany, Luxembourg and Austria
Regular expression, a sequence of characters to match text against a specified pattern
Renewable energy
Resident Evil, popular video game franchise of survival horror
Reverse engineering
Relative effectiveness, or RE factor, an expression of an explosive's demolition power
Reynolds number, a dimensionless quantity in fluid mechanics used to help predict flow patterns
Rhenium, a chemical element with the symbol 'Re'
In re, Latin for 'in the matter of...'
RE: and Re:, used in email subject lines as a shortened form of in re
Royal Engineers, a part of the British Army
Royal Society of Painter-Printmakers, whose fellows may use the Post-nominal letters RE