Third-party members of the United States House of Representatives are very rare at any point of time. Although the current two-party system in the U.S., with the Republican party and Democratic party, started in 1856, many of the older parties still existed and had an influence. Therefore, this article includes any politician since the end of Reconstruction or since the 45th United States Congress.
These galleries and lists include anyone who at one time, while in office, was an independent or affiliated with a third party. They are listed in descending order from the first year they were in office as something other than a Republican or Democrat.
Since 1877, there have 111 third party U.S. Representatives: 6 from Modern era, 36 from Progressive era, 44 from Populist era, and 25 from Greenback era.
1949–2010: Modern era 
1913–1948: Progressive era 
1891–1913: Populist era 
1877–1890: Greenback era