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A national academy is an organizational body, usually operating with state financial support and approval, that co-ordinates scholarly research activities and standards for academic disciplines, most frequently in the sciences but also the humanities. Typically the country's learned societies in individual disciplines will liaise with or be co-ordinated by the national academy. National academies play an important organizational role in academic exchanges and collaborations between countries.
The extent of official recognition of national academies varies between countries. In some cases they are explicitly or de facto an arm of government; in others, as in the United Kingdom, they are voluntary, non-profit bodies with which government has agreed to negotiate, and which may receive government financial support while retaining substantial independence. In the countries of the former Soviet Union, and in the People's Republic of China, the national academies have considerable power over policy and personnel in their areas. There is however a growing consensus among international federations of learned academies that bona fide national (or learned) academies need to adhere to certain criteria:
- The fellowship is elected, on the basis of excellence, by existing fellows
- The number of fellows is restricted either to a total number or to a rate of accretion
- The governance of the academy is democratic and “bottom up”. The fellowship is the ultimate source of the academy’s authority
- The academy is independent of government, industry and professional associations. Most, if not all, academies derive some financial support from some or all of these other organizations but this support needs to be given in a manner that does not compromise the academy’s independence.
In some countries, a single academy covers all disciplines; an example is France. In others, there are several academies, which work together more or less closely; for example, Australia. In many states there are organized in Academy of Sciences.
Academies by country
- Albania: Academy of Sciences of Albania
- Armenia: Armenian National Academy of Sciences
- Australia: Australian Academy of Science, Australian Academy of Technological Sciences and Engineering, Australian Academy of the Humanities, Academy of the Social Sciences in Australia, National Academies Forum
- Austria: Austrian Academy of Sciences
- Belarus: National Academy of Sciences of Belarus
- Bosnia and Herzegovina: Academy of Sciences and Arts of Bosnia and Herzegovina
- Bulgaria: Bulgarian Academy of Sciences
- Canada: Royal Society of Canada
- Cambodia: The Royal Academy of Cambodia
- People's Republic of China: Chinese Academy of Sciences, Chinese Academy of Social Sciences, Chinese Academy of Engineering, Chinese Academy of Medical Sciences
- Croatia: Croatian Academy of Sciences and Arts
- Czech Republic - Academy of Sciences of the Czech Republic
- Denmark: Royal Danish Academy of Sciences and Letters
- Estonia: Estonian Academy of Sciences
- Finland: national academies based on language. The Finnish Academy of Science and Letters (Finnish: Suomalainen tiedeakatemia) is the Finnish-speaking academy, while The Finnish Society of Science and Letters (Swedish: Finska vetenskaps-societeten, Finnish: Suomen tiedeseura) is mostly Swedish-speaking. In the field of engineering, the Finnish Academy of Technology (Finnish: Teknillisten tieteiden akatemia, Swedish: Akademin för Tekniska Vetenskaper) and Swedish Academy of Engineering Sciences in Finland (Swedish: Svenska tekniska vetenskapsakademien i Finland) form a corresponding pair. The Academy of Finland is not an academy in the sense of this article, but the state research funding agency.
- France: the Institut de France groups together five academies, including the Académie française
- Germany: Leopoldina
- Greece: Academy of Athens
- Hong Kong: Hong Kong Academy of the Humanities 香港人文學院
- Hungary: Hungarian Academy of Sciences (Hungarian: Magyar Tudományos Akadémia)Hungarian Academy of Sciences 
- Ireland: Royal Irish Academy
- Israel: Israel Academy of Sciences and Humanities
- Italy: Accademia dei Lincei for sciences, Accademia della Crusca for Italian language, Accademia nazionale delle scienze; a general and supreme national academy was the Accademia d'Italia during the Fascist period
- Japan: The Japan Academy
- Netherlands: The Royal Netherlands Academy of Arts and Sciences
- Norway: The Norwegian Academy of Science and Letters
- Pakistan: Pakistan Academy of Letters, Pakistan Academy of Sciences
- Poland: Polish Academy of Sciences, Polish Academy of Learning
- Portugal: Academia das Ciências de Lisboa
- Republic of China (Taiwan): Academia Sinica
- Romania: Romanian Academy covers the scientific, artistic and literary domains.
- Russia: Russian Academy of Sciences is the main body that is organizing work in fundamental sciences and humanities in Russia. There exist independently 5 specialized national academies: Russian Academy of Medical Sciences, Russian Academy of Architecture and Construction Sciences , Russian Academy of Education, Russian Academy of Agriculture Sciences, and Russian Academy of Arts. All of them are self-ruled, but supported by the government.
- Scotland: Royal Society of Edinburgh
- Serbia: Serbian Academy of Sciences and Arts
- Slovenia: Slovenian Academy of Sciences and Arts
- Spain: The Royal Academy is the main reference body for the spanish language. Royal Academy of Fine Arts of Saint Ferdinand covers the artistic fields; Real Academia de la Historia is the organising body for History; the Royal Academy of Moral and Political Sciences covers the humanities; Royal Academy of Exact, Physic and Natural Sciences covers natural sciences and mathematics; Royal Academy of Law covers the field of law.
- Sweden: Swedish Academy for language, Royal Swedish Academy of Sciences
- Thailand: Royal Institute of Thailand
- Turkey: Turkish Academy of Sciences is funded by the government but maintains autonomy
- Ukraine: National Academy of Sciences of Ukraine
- United Kingdom: the Royal Society is recognised as the national academy for the sciences, the British Academy for the social sciences and the humanities, the Royal Academy for art, and the Royal Academy of Engineering and the Academy of Medical Sciences for their areas
- United States: The United States National Academies comprises four organizations: the National Academy of Sciences (NAS), the National Academy of Engineering (NAE), the Institute of Medicine (IOM), and the National Research Council (NRC). See also American Academy of Arts and Sciences, American Academy of Arts and Letters, American Academy of Diplomacy, Academy of American Poets, National Academy of Design.
- Vatican City: Pontifical Academy of Sciences
Within most countries, the unqualified phrase "National Academy" will normally refer to that country's academy. Within the United States, the plural phrase "National Academies" is widely understood to refer to the U.S. National Academies.