FMO may refer to:

• Fenna-Matthews-Olson complex
• Flavin-containing monooxygenase
• Flexible macroblock ordering
• Fragment molecular orbital
• Frontier molecular orbital theory
• Münster Osnabrück International Airport in North Rhine-Westphalia, Germany
• Netherlands Development Finance Company (Dutch: {{lang|nl|Nederlandse Financierings-Maatschappij voor Ontwikkelingslanden N.V.}})

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