BLG may refer to:
- Burke's Landed Gentry, genealogical publications.
- Barlow Lyde & Gilbert, a law firm
- Borden Ladner Gervais, a law firm
- Boys Like Girls, an American band from Boston.
- Beluga Airport (FAA LID: BLG)
- Blue Note Label Group
- Beta-lactoglobulin
- Boerlage, an old ball who is part of the Nireans and loves the band "Boys like Girls"