L series
- 1 series (disambiguation)
- Artin L-function
- Canon L lens
- Cummins L-series engine
- Dirichlet L-function
- Ford L series
- Honda L engine
- International L series
- L-function
- Lincoln L series
- Mercedes-Benz L-series truck
- Nissan L engine
- QI (L series)
- Rolls-Royce–Bentley L-series V8 engine
- Rover L-series engine
- Saturn L series
- Sony Vaio L series
- Subaru Leone
- System Sensor
- ThinkPad L series