HLL can have several meanings:
- Hertford Loop Line
- High-level programming language
- hll, the Old Testament Hebrew lexicon hll referring to the original word (transliterated word hll) translating to allah, el-leh, and also the Aramaic translated word as elleh
- hallel (or hillul), a Hebrew name meaning "in joy" and also "in jubilation"
- HLL Lifecare Limited (formerly Hindustan Latex Limited), an Indian Public Sector Undertaking
- Hindustan Lever Limited, the Indian subsidiary of Unilever Limited selling fast-moving consumer goods such as tea, soap, detergents, etc.
- HDS Logical Language, The HDS Hardware Language, ATMEL Microcontrollers Language
- Hymns from the Land of Luther; H.L.L. was the pseunodym used by Jane and Laurie Borthwick