LLI or Lli may refer to:
Lli (trigraph) : A trigraph used in French. Londonderry Light Infantry, an Irish Militia regiment raised in County Londonderry Low latent inhibition (LLI), a medical condition related to Latent inhibition which is concerned with the different observations that a stimulus adapts to. Levelled Literacy Interventions, teaching resources published by Heinemann, sequenced according to the Fountas and Pinnell reading levels Lucena Lines, Inc., a subsidiary of Jac Liner, Inc. and a bus company in the Philippines. Universal Wrestling Association, also known as Lucha Libre Internacional Unequal leg length or leg length inequality