The abbreviation LM or lm may refer to:
No.5551 The Unknown Warrior is a steam locomotive which is under construction as a "new-build" project.
LM PHP (Language management PHP) is a library for language management and multi-language support in the PHP-based application backends.
Lamin A/C also known as LMNA is a protein that in humans is encoded by the LMNA gene. Lamin A/C belongs to the lamin family of proteins.