The abbreviation LM or lm may refer to:

• County Leitrim, Ireland (vehicle plate code LM)
• Le Mans, a place in France
• Limburg-Weilburg, Germany (vehicle plate code LM)
• Liptovský Mikuláš, Slovakia (vehicle plate code LM)
• Lourenço Marques, Pearl of the Indian Ocean, Mozambique
• Lower Mainland, a region in British Columbia, Canada

• Little Mix, a British four-piece girl group
• LM (magazine), a defunct British computer game magazine
• Living Marxism magazine, published under the name LM between 1997 and 2000

• L&M, a brand of cigarettes
• Ledgewood Mall, a shopping mall in New Jersey
• Legg Mason, a U.S. investment management firm; NYSE ticker symbol
• Lockheed Martin, a U.S. defense contractor

• ALM Antillean Airlines, a Netherlands Antillean airline; IATA airline designator code
• Livingston Energy Flight, an Italian airline; IATA airline designator code
• Loganair, a Scottish airline; IATA airline designator code
• London Midland, a rail operator based in the West Midlands, England

• IS/LM model in macroeconomics, where LM refers to Liquidity preference-Money supply
• Lean manufacturing
• Maltese lira, the former currency of Malta

• Liberal Movement (Australia), a defunct Australian political party
• Lower Merion High School, a Pennsylvania secondary school

• Lagrange multiplier, a method for finding maxima and minima subject to constraints
• LAN Manager, a Microsoft network operating system
• Language model, a mathematical model used in language processing and speech recognition
• Lebesgue measure, in measure theory
• Levenberg–Marquardt algorithm, used to solve non-linear least squares problems
• Linear Monolithic, a National Semiconductor prefix for integrated circuits; see List of LM-series integrated circuits
• LM hash, a Microsoft password hash function
• Long mode, a CPU mode of operation where 64-bit programs are executed (lm is also set as a CPU flag)

• Apollo Lunar Module spacecraft
• Leonard-Merritt mass estimator, a formula for estimating the mass of a spherical stellar system
• Light meter
• Light microscope
• Line maintenance, a type of Aircraft maintenance checks
• Lumen (unit), a unit of luminous flux

• 24 Hours of Le Mans race, and related car models
• Late model, a class of Racing car
• Left midfielder, a defensive position in association football

• Legion of Merit, a United States military decoration

• 1M (disambiguation)
• IM (disambiguation)