FDN may refer to:
Organizations Dolphin Air, a defunct Ermirati airline Flying Doctors Nigeria, an air ambulance service French Data Network, a French non-profit Internet service provider Fruta del Norte mine, an Ecuadorian gold mine
Politics National Democratic Front (Mexico) (Spanish: ), a defunct political coalition National Democratic Front (Peru) (Spanish: ), a defunct political party New Democratic Forces (French: ), a defunct political party in the Republic of the Congo Nicaraguan Democratic Force (Spanish: ), a Nicaraguan Contra group Nigerien Democratic Front (French: ), a defunct political party of Niger
Other uses Fairbanks Daily News-Miner, a newspaper in Fairbanks, Alaska, US Faridabad New Town railway station, in Haryana, India Fixed Dialing Number, in telephony