National Symphony Orchestra (disambiguation)
National Symphony Orchestra is used for the name of many orchestras in different countries.  It may refer to the:

 Danish National Symphony Orchestra, founded 1925
 Estonian National Symphony Orchestra, which can trace its origins back to 1926
 Iraqi National Symphony Orchestra, founded 1970, which can trace its origins back to 1948
 Latvian National Symphony Orchestra
 Lebanese National Symphony Orchestra, founded 1999
 Myanmar National Symphony Orchestra
 National Iranian Symphony Orchestra, founded 1998
 National Symphony Orchestra (Bolivia)
 National Symphony Orchestra of Colombia, the re-establishment in 2004 of an orchestra founded in 1952
 National Symphony Orchestra of Costa Rica, founded 1940
 National Symphony Orchestra of Cuba, traces its origins to the latter 18th Century, formalized in the early 1920s
 National Symphony Orchestra (Dominican Republic), founded 1941
 National Symphony Orchestra of Ecuador
 National Symphony Orchestra Ghana
 RTÉ National Symphony Orchestra of Ireland, founded 1947, adopted present name 1989
 National Symphony Orchestra of London, plays mostly popular music rather than classical, began in the 1940s
 National Symphony Orchestra (Malaysia)
 National Symphony Orchestra (Mexico), present form since 1946, can trace its origins to 1881
 National Symphony Orchestra (Peru), founded 1938
 National Symphony Orchestra of Polish Radio
 National Symphony Orchestra of the South African Broadcasting Corporation
 National Symphony Orchestra (Taiwan), founded 1986
 National Symphony Orchestra of Ukraine
 National Symphony Orchestra (United States), founded 1931
 The Syrian National Symphony Orchestra, Damascus, Syria