BLG
BLG may refer to:
 Former ISO 639-3 code for Balau, a dialect of the Iban language. Barlow Lyde & Gilbert, a British law firm
 Belaga Airport, Sarawak, Malaysia
 Beluga Airport, Alaska
 Beta-lactoglobulin
 Bilibili Gaming, a Chinese esports franchise
 BLG Logistics Group, a German seaport and logistics company in Bremen. Borden Ladner Gervais, a Canadian law firm
 Burke's Landed Gentry, a genealogical publication