- L[ow] language: Diglossia
- L1 acquisition: see acquisition
- L1 attrition: Language Attrition
- L1 influence, tone perception: Acquisition of Tone, L2 | Perception and Production of Chinese Sounds by Non-native Speakers
- L2 acquisition: see acquisition
- L2 Chinese: see Teaching Chinese as a Foreign Language
- labeling, using Roman letters: Roman Letters in Chinese Writing
- labiodentalization, Northwestern Medieval Chinese: Northwest Medieval Chinese
- labiovelars: Haudricourt, André-Georges (1911–1996)
- Labovian approach: Sociolinguistics
- Lachi language (Lājī 拉基): Tai-Kadai L…