LMB is the abbreviation of:

• La Martiniere College for Boys, Kolkata
• Laboratory of Molecular Biology, a research institute in Cambridge, England
• Left Mouse Button on a mouse (computing)
• Leptomycin B, an inhibitor of protein export from the cell nucleus
• Liga Mexicana de Beisbol, the Mexican Baseball League
• Line Mode Browser, the first multi-platform web browser
• Lois McMaster Bujold, science fiction and fantasy author

• Class (2016 TV series)
• Class (2017 Pacifico novel)
• Class (2017 Rosenfeld novel)
• Class 230
• Class 23 (disambiguation)
• Class 2600
• Class 2700
• Class 2900
• Class 2 element
• Class 2 truck
• Class 311
• Class 311 (disambiguation)
• Class 313 (disambiguation)
• Class 319 (disambiguation)
• Class 321
• Class 321 (disambiguation)
• Class 325
• Class 331
• Class 333
• Class 345
• Class 360
• Class 363
• Class 378 (disambiguation)
• Class 380
• Class 380 (disambiguation)