Third Force may refer to:

Politics

• Third party (politics), party other than one of the two dominant ones in a two-party political system
  • Third party (United States), in American politics
  • Third parties in a two-party system, in which two political parties dominate voting in nearly all elections at every level of government
  • Chinese Peasants' and Workers' Democratic Party, called "Third party" in the 1930s
• Third Force, a term referring to Canadians of neither British or French descent; see Multiculturalism in Canada § Incipient stage (pre-1971)
• Third Force (China), attempts to establish another force against the authoritarian Kuomintang and the radical Chinese Communist Party during the Republic of China (1912-1949) era, and also attempts to establish an alternative to the Chinese-Communist-Party-lead People's Republic of China as well as the Kuomintang-lead Republic of China after the establishment of PRC and expulsion of KMT from Mainland China in 1949
• Third Force (France), a French political coalition during the Fourth Republic
• Third Force (Hong Kong), a political party in Hong Kong, supportive of China
• Third Force (Iran), a socialist–nationalist political movement in Iran during Abadan Crisis
• Third Force (Northern Ireland), a former Northern Irish paramilitary organisation
• Third Force (Myanmar), the informal name given to a collection of new political parties in Myanmar which contested the 2010 Burmese elections
• Third force (1996 Russian presidential election), an electoral coalition proposed during the 1996 Russian presidential election
• Third Force (South Africa), a late apartheid era militants, resistant to change
• Third Force (Ukraine), a Ukrainian political party

Music

• 3rd Force, a smooth jazz band
• Third Force, a 1991 Jazz CD by American composer and saxophonist/multi-instrumentalist Thomas Chapin