The abbreviation LM or lm may refer to:

• companies:
  • Legg Mason, a U.S. investment management firm; NYSE ticker symbol
  • Livingston Energy Flight, an Italian airline; IATA airline designator code
  • Lockheed Martin, a U.S. defense contractor
  • London Midland, a rail operator based in the West Midlands, England.
• in economics and business studues:
  • IS/LM model in macroeconomics, where LM refers to Liquidity preference-Money supply
  • Lean manufacturing
• in mathematics, science and statistics:
  • Language model, mathematical model used in language processing and speech recognition
  • Leonard-Merritt mass estimator
  • Levenberg–Marquardt algorithm
  • Lumen, unit of luminous flux
• military:
  • Legion of Merit a United States military decoration
• in motor sport:
  • 24 Hours of Le Mans race, and related car models
  • Late model Class of Racing car.
• people:
  • Lionel Messi
  • Luis Miguel, Mexican singer
• in politics:
  • Liberal Movement, a defunct Australian political party.
• publishing:
  • Living Marxism magazine, published under the name LM between 1997 and 2000
• technology:
  • Apollo Lunar Module spacecraft
  • LAN Manager, a network operating system developed by Microsoft
  • Light meter
  • Linear Monolithic, a method of IC fabrication in which the circuit components are in and on the surface of a single piece of a wafer (e.g LM741 and LM555)
  • LM hash, a Microsoft password hash function
• miscellaneous:
  • LM, licence plate code for Limburg-Weilburg in Germany
  • LM, licence plate code for Liptovský Mikuláš in Slovakia
  • L&M, a brand of cigarettes
  • Lower Merion High School, a Pennsylvania secondary school
  • LM, a publication by Newsfield publications in the UK
• geography:
  • Lower Mainland, a region in British Columbia, Canada

• IM (disambiguation)