HLB

HLB may refer to:

• Halbi language of central India
• Helium light band, unit of surface flatness
• Hessian Ludwig Railway (German: ), a former German railway company
• Hessische Landesbahn, a German transport company
• High level bombing
• Hildenborough railway station, in England
• Hillsborough Resources, a Canadian coal-mining company
• HLB International, an international network of accountancy firms
• H.L. Boulton, a Venezuelan import and export company
• H. L. Bourgeois High School, in Gray, Louisiana, United States
• Hong Leong Bank, a Malaysian bank
• Huanglongbing, a disease of citrus fruits
• Hydrophilic-lipophilic balance, of a surfactant
• The Helminthosporium Leaf Blights, from their former classification in the genus Helminthosporium:

• Southern corn leaf blight
• Northern corn leaf blight
• Northern corn leaf spot