MBL may refer to:

Education

• Marine Biological Laboratory, an international center for research and education in biology, biomedicine, and ecology
• Master of Business and Law, a two-year master's degree credential
• National Security College (Israel)

Politics

• Free Bolivia Movement (Spanish: Movimiento Bolivia Libre), a political party in Bolivia
• Free Brazil Movement (Portuguese: Movimento Brasil Livre), a libertarian Austrian-school inspired political movement in Brazil

Science

• Mannan-binding lectin (or mannose-binding lectin), a protein capable of binding certain sugars and polysaccharides
• Many-body localization, a state of matter in which a local set of particles cannot reach thermal equilibrium
• Monoclonal B-cell lymphocytosis, a condition that resembles chronic lymphocytic leukemia (CLL)

Sport

• Malaysian Basketball League, former name of the Malaysia National Basketball League, the pre-eminent men's basketball league in Malaysia
• Midwest Basketball League, a semi-professional men's basketball league which operates in the Midwestern United States

Transportation

• Manistee County-Blacker Airport (IATA/FAA code MBL), an airport in the US state of Michigan
• Montclair-Boonton Line, a commuter rail line in North Jersey in the US state of New Jersey
• Montebello Bus Lines, a local transit agency serving the San Gabriel Valley in Southern California

Other uses

• Marie Byrd Land, region of West Antarctica
• Macquarie Bank Limited, name of the Macquarie Group (a publicly traded Australian financial-services corporation) prior to its restructuring in 2007

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