0L (zero L) or 0-L may refer to:
- 0L, an abbreviation for 0 longitude, or the prime meridian
- 0L, an abbreviation in physics for zeroth law of thermodynamics
- 0L, an abbreviation in rocketry for zero length launch
- 0L, an abbreviation for zero in the Lebesgue measure
- 0L, an abbreviation in aerodynamics for zero lift axis
- 0L, an abbreviation for zero-length spring, a hypothetical type of spring
- 0L, the period between a person being accepted into law school and starting their first year of education (1L)