BLW or blw may refer to:

• Baby-led weaning, an approach to adding complementary foods to a baby's diet of breast milk or formula
• Baldwin Locomotive Works, a defunct American manufacturer of railroad locomotives
• Brightline West, a future high-speed rail route
• BLW, the IATA code for Beledweyne Airport, Somalia
• BLW, the Indian Railways station code for Balawali railway station, Uttar Pradesh, India
• blw, the ISO 639-3 code for Balangao language, Luzon, Philippines