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- Landsraad – The Assembly of all nobles in the Imperium.
- Lasgun – Handheld energy weapon, technically a "continuous-wave laser projector;" also lasegun.
- Laza tiger – A breed of tiger brought to Salusa Secundus "almost eight thousand years" before the events of Children of Dune. "Genetic manipulation of the ancient Terran stock had erased some of the original tiger features and refined other elements. The fangs remained long. Their faces were wide, eyes alert and intelligent. The paws were enlarged to give them support on uneven terrain and their sheathed claws could extend some ten centimeters, sharpened at the ends into razor tips by abrasive compression of the sheath. Their coats were a flat and even tan which made them almost invisible against sand."
- Little Maker – The "half-plant-half-animal deep-sand vector of the Arrakis sandworm," whose "excretions form the pre-spice mass."
- Lost Tleilaxu – Offshoot race of the Bene Tleilax, formed in The Scattering.
- Levenbrech – A military rank that is roughly in between a sergeant and a lieutenant.
Read more about this topic: Glossary Of Dune Terminology