FDD

• CNDD-FDD, a political party in Burundi
• Forum for Democracy and Development, a political party in Zambia
• KAZE-FDD, a political party in Burundi

• Familial Danish dementia, a rare form of dementia

• Floppy disk drive
• Frequency-division duplex, a telecommunications duplex indexing method
• Frequency domain decomposition, a system identification technique
• LTE-FDD, a 4G telecommunications technology and standard
• Timex FDD, a nearly complete computer by Timex
• UMTS-FDD, an air interface standard in 3G mobile telecommunications networks
• Fault detection and diagnostics, by Automated Logic Corporation

• Feature-driven development, a project management approach
• Forces for the Defense of Democracy, a rebel group in Burundi
• Foundation for Defense of Democracies, a policy institute based in Washington, D.C., US
• Franchise disclosure document (2008), UFDD/UFOC Uniform Franchise Offering Circular
• The Danish Scout Council, formerly the Fællesrådet for Danmarks Drengespejdere
• "F.D.D.", the opening theme to the anime Chaos;Head sung by Kanako Itō

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