Per is a Latin preposition which means "through" or "for each", as in per capita.
Per or PER may also refer to:
Places
- IOC country code for Peru
- Pér, a village in Hungary
- Chapman code for Perthshire, historic county in Scotland
Math and statistics
- Rate (mathematics), ratio between quantities in different units, described with the word "per"
- Price–earnings ratio, in finance, a measure of growth in earnings
- Player efficiency rating, a measure of basketball player performance
- Partial equivalence relation, class of relations that are symmetric and transitive
- Physics education research
Science
- Perseus (constellation), standard astronomical abbreviation
- Period (gene) or per that regulates the biological clock and its corresponding protein PER
- Protein efficiency ratio, of food
- PER or peregrinibacteria, a candidate bacterial phylum
Media and entertainment
- PeR (band), a Latvian pop band
- Per (film), a 1975 Danish film
Transport
- IATA code for Perth Airport in Western Australia
- National Rail station code for Penrhiwceiber railway station, Rhondda Cynon Taf, Wales
Other
- Per (given name), a Scandinavian form of Peter
- Per (storm), a storm in Sweden, in January 2007
- Packed Encoding Rules, in computing, an ASN.1 wire format
- Per sign