BLM may stand for:
- Saint Barthélemy using ISO 3166-1 alpha-3 country code
- Bergbahn Lauterbrunnen-Mürren, a railway in Switzerland, part funicular, part adhesion
- Bilayer lipid membrane
- Black Mage, a job in Final Fantasy XI
- Bleed Like Me, 4th studio album by Garbage
- Bloom syndrome, or the Bloom syndrome gene
- Block Land Mods, a mod for the beta version of the game Blockland
- Brushless Motor, a brushless DC or AC motor
- Bureau of Land Management, United States
- Monmouth Executive Airport IATA code