FDD may refer to:
Politics CNDD-FDD, a political party in Burundi Forum for Democracy and Development, a political party in Zambia KAZE-FDD, a political party in Burundi
Science and technology
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
Other uses 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