ENR may refer to:
In organizations:
- Energizer Holdings, an American manufacturer that has NYSE code ENR
- Emissora Nacional de Radiodifusão, now Rádio e Televisão de Portugal, the Portuguese public service broadcasting corporation
In transportation:
- Egyptian National Railways, the national railway in Egypt
- Esquimalt and Nanaimo Railway
- East Norfolk Railway, a former railway in the United Kingdom, now site of the heritage Bure Valley Railway
Other:
- Engineering News-Record, a weekly magazine about construction by McGraw-Hill Construction
- Enoyl-acyl carrier protein reductase, an enzyme which catalyzes an essential step in fatty acid biosynthesis
- Esercito Nazionale Repubblicano (National Republican Army), the army of the Italian Social Republic from 1943 to 1945
- Ending Net Receivable, a financial term used by certain credit card companies
- Excess Noise Ratio, in radio frequency electronics a normalized measure of how much the noise power is above the thermal noise floor