RER may refer to:
Transport
editIn France
edit- Réseau Express Régional, or RER d'Île-de-France, the commuter rail service serving Paris and its suburbs
- Réseau Express Régional Franco-Valdo-Genevois, now called Léman Express, commuter rail service serving Geneva (Switzerland), Annemasse (France) and its suburbs
In Belgium
edit- Réseau express régional Bruxellois ('Brussels Regional Express Network'), the commuter rail service serving Brussels and its suburbs and commuters
- Réseau Express Régional Gantois ('Ghent Regional Express Network'), the commuter rail service serving Ghent and its suburbs and commuters
In Switzerland
edit- Réseau Express Régional Bernois, the name used for the Bern S-Bahn in French speaking areas.
- Réseau Express Régional Vaudois, commuter rail service serving Vaud and its suburbs
- Réseau Express Régional Fribourgeois, commuter rail service serving Fribourg and its suburbs
- Réseau Express Régional trinational de Bâle, the name used for the Basel S-Bahn in French speaking areas.
- Réseau Express Régional franco-valdo-genevois, now called Léman Express, commuter rail service serving Geneva, Annemasse and its suburbs
In Argentina
edit- Red de Expresos Regionales, a planned commuter rail service in Buenos Aires
In Canada
edit- GO Regional Express Rail, now known as GO Expansion, a planned commuter rail service in Toronto and its suburbs
Other uses
edit- Rebuilt Reading electric multiple units
- The Real Estate Roundtable, a non-profit public policy organization that represents the interests of real estate
- Real exchange rate, the purchasing power of a currency relative to another at current exchange rates and prices
- RēR, the standard abbreviation for the label Recommended Records
- Resident Evil: Revelations, a Capcom game
- Respiratory exchange ratio, the ratio between the amount of carbon dioxide produced in metabolism and oxygen used
- Rough endoplasmic reticulum, a type of endoplasmic reticulum protein-manufacturing ribosomes
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