LER
- Anthony Ler
- Elite One Championship
- Label edge router
- Land equivalent ratio
- Larry LaLonde
- Leinster Airport
- Ler (mythology)
- Ler, Norway
- Ler, South Sudan
- Leytonstone High Road railway station
- Light-emitting resistor
- Liquid epoxy resin
- Locus of enterocyte effacement-encoded regulator
- London Electric Railway
- Loss Exchange Ratio
- Luminous efficacy of radiation
- Lunar Electric Rover
- M. A. Foster
- Multiple cropping
- The Loyal Edmonton Regiment