**0E** (zero E) or **0-E** may refer to:

- OE, or zero East, longitude for the Prime Meridian
- 0e, or On30 European notation for 0 scale using 16.5mm track
- 0 emission, or Zero emission
- 0 energy or Zero energy
- zero energy building (ZEB), a building's use with zero net energy consumption and zero carbon emissions
- Zero-energy Universe concept that the Universe's total amount of energy is exactly zero

- 0 element, or Zero element, one of several generalizations of the number zero to other algebraic structures