FNA
FNA may refer to: 
 Algerian National Front (French: )
 β-FNA, beta-funaltrexamine, an opioid antagonist
 Farmers of North America, a Canadian agricultural company
 Fars News Agency, in Iran
 Fédération Française Aéronautique, a French aeroclub association
 "fast, neat, average", the response to which is a shibboleth of the US Air Force academy 
 Ferrell North America, an American propane company
 Filipino Nurses Association, now the Philippine Nurses Association
 Fine-needle aspiration
 Flora of North America, a multivolume botanical work
 Fondo Nacional de las Artes (National Endowment for the Arts), in Argentina
 Guatemalan Athletics Federation (Spanish: )
 Lungi International Airport, in Sierra Leone
 Nicaraguan Athletics Federation (Spanish: )
 Norlandair, an Icelandic airline
 a free, open-source reimplementation of the Microsoft XNA Game Studio libraries