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