FMO

FMO may refer to:

• Fenna-Matthews-Olson complex
• Fish Marketing Organisation, a statutory body of Hong Kong
• Flavin-containing monooxygenase
• Flexible macroblock ordering
• Fragment molecular orbital
• Francisco Morazán Department, a department in Honduras
• Frontier molecular orbital theory
• Münster Osnabrück Airport in North Rhine-Westphalia, Germany
• Netherlands Development Finance Company (Dutch: {{lang|nl|Nederlandse Financierings-Maatschappij voor Ontwikkelingslanden N.V.}})