List of socialist members of the United States Congress

As of March 16, 2023^[update]:

Member	Photo	Chamber	Term start	Term end	State	Party		Ref
Greg Casar		House	January 3, 2023	Incumbent	Texas		Democratic Party (DSA member, former Austin DSA endorsee)	[4][5]
Summer Lee		House	January 3, 2023	Incumbent	Pennsylvania		Democratic Party (former DSA member and former DSA endorsee[a])	[6][7]
Cori Bush		House	January 3, 2021	Incumbent	Missouri		Democratic Party (DSA member and endorsee)	[2][8][9]
Jamaal Bowman		House	January 3, 2021	Incumbent	New York		Democratic Party (DSA member and NYC-DSA endorsee)	[2][10][11][12]
Alexandria Ocasio-Cortez		House	January 3, 2019	Incumbent	New York		Democratic Party (DSA member and endorsee)	[2][13]
Rashida Tlaib		House	January 3, 2019	Incumbent	Michigan		Democratic Party (DSA member and endorsee)	[2][13]
Ilhan Omar		House	January 3, 2019	Incumbent	Minnesota		Democratic–Farmer–Labor Party	[b]
Bernie Sanders		Senate	January 3, 2007	Incumbent	Vermont		Independent (won all Democratic Party primaries)	[18][19][20]
Danny Davis		House	January 3, 1997	Incumbent	Illinois		Democratic Party (former New Party member and DSA member)	[c]
Bernie Sanders		House	January 3, 1991	January 3, 2007	Vermont		Independent (won most Democratic Party votes)	[18][19][20]
Major Owens		House	January 3, 1983	January 3, 2007	New York		Democratic Party (DSA member)	[13][25]
David Bonior		House	January 3, 1977	January 3, 2003	Michigan		Democratic Party (DSA member)	[26][27]
Ron Dellums		House	January 3, 1971	February 6, 1998	California		Democratic Party (DSA member)	[13][28]
John Conyers		House	January 3, 1965	December 5, 2017	Michigan		Democratic Party (DSA member)	[29]
William H. Meyer		House	January 3, 1959	January 3, 1961	Vermont		Democratic Party (Future Liberty Union Party founder)	[30]
Andrew Biemiller		House	January 3, 1949	January 3, 1951	Wisconsin		Democratic Party (former Socialist Party of America member)	[31]
Leo Isacson		House	February 17, 1948	January 3, 1949	New York		American Labor Party	[32]
Andrew Biemiller		House	January 3, 1945	January 3, 1947	Wisconsin		Democratic Party (former Socialist Party of America member)	[31]
Hugh De Lacy		House	January 3, 1945	January 3, 1947	Washington		Democratic Party (Communist Party USA member)	[33]
Bolívar Pagán		House	December 26, 1939	January 3, 1945	Puerto Rico		Republican Union (Socialist Party member)
Vito Marcantonio		House	January 3, 1939	January 3, 1951	New York		American Labor Party	[32][34]
John Bernard		House	January 3, 1937	January 3, 1939	Minnesota		Minnesota Farmer–Labor Party (Future Communist Party USA member)	[35][36]
Jerry J. O'Connell		House	January 3, 1937	January 3, 1939	Montana		Democratic Party	[37]
Jerry Voorhis		House	January 3, 1937	January 3, 1947	California		Democratic Party (former Socialist Party of America member)	[38]
Vito Marcantonio		House	January 3, 1935	January 3, 1937	New York		Republican Party	[32][34]
Santiago Iglesias		House	March 4, 1933	December 5, 1939	Puerto Rico		Socialist Party
Homer Bone		Senate	January 3, 1933	November 13, 1944	Washington		Democratic Party (former Socialist Party of America member)	[39]
Fiorello LaGuardia		House	March 4, 1927	March 3, 1933	New York		Republican Party (former Socialist Party of America candidate and self-identified socialist)	[40]
Fiorello LaGuardia		House	March 4, 1925	March 4, 1927	New York		Socialist Party of America and Progressive Party	[40]
Fiorello LaGuardia		House	March 4, 1923	March 4, 1925	New York		Republican Party (future Socialist Party of America candidate and self-identified socialist)	[40]
Victor Berger		House	March 4, 1923	March 3, 1929	Wisconsin		Socialist Party of America	[13]
Meyer London		House	March 4, 1921	March 3, 1923	New York		Socialist Party of America	[13]
Victor Berger		House	March 4, 1919	November 10, 1919	Wisconsin		Socialist Party of America	[13]
Fiorello LaGuardia		House	March 4, 1917	December 31, 1919	New York		Republican Party (future Socialist Party of America candidate and self-identified socialist)	[40]
George Lunn		House	March 4, 1917	March 4, 1919	New York		Democratic Party (former Socialist Party of America member)	[41]
Meyer London		House	March 4, 1915	March 3, 1919	New York		Socialist Party of America	[13]
Harry Lane		Senate	March 4, 1913	May 23, 1917	Oregon		Democratic Party	[42]
Victor Berger		House	March 4, 1911	March 3, 1913	Wisconsin		Socialist Party of America	[13]
Freeman Knowles		House	March 4, 1897	March 3, 1899	South Dakota		People's Party (United States) (Future Socialist Party of America Member)	[43]
Kittel Halvorson		House	March 3, 1891	March 4, 1893	Wisconsin		People's Party (United States) (Future Socialist Party of America Member)	[44]
Lewis Featherstone		House	March 5, 1890	March 3, 1891	Arkansas		Union Labor Party
Henry Smith		House	March 4, 1887	March 3, 1889	Wisconsin		Union Labor Party	[45]
Horace Greeley		House	December 4, 1848	March 3, 1849	New York		Whig Party (United States)	[46]
Robert Dale Owen		House	March 4, 1843	March 3, 1847	Indiana		Democratic Party	[47]

• Maxwell Frost (1997–, FL-10) is a progressive and the first Generation Z member of Congress. Frost explicitly does not identify as socialist, saying "my family fled that".^[48]
• Ayanna Pressley (1974–, MA-07) is a member of "The Squad". Pressley explicitly does not identify as socialist.^[49][50]
• Shri Thanedar (1955–, MI-13) is a Democrat and expelled DSA member. Thanedar is not considered a socialist or reflective of the values of the organization.^[51][52]
• Raúl Grijalva (1948-, AZ-7) is a Democrat and member of the Congressional Progressive Caucus, Blue Collar Caucus and the Justice Democrats. He has been ranked as among the most left leaning members of congress by GovTrack and National journal, and was a member of the Raza Unida Party in his youth, but has not governed as a socialist.
• George Crockett Jr. (1909–1996, MI-13) was a National Lawyers Guild member who attended the DSA founding conference, but never joined the group itself.^[53]
• Allard K. Lowenstein (1969-1971, NY-5) was aligned with many New Left causes and was supported in his campaigns by DSA members such as Ron Dellums but never identified as a socialist himself.
• Robert M. La Follette (1855–1925, WI-Sen) aligned himself with Socialist groups but never identified as a Socialist himself.^[54]
• American Labor Party–Democratic Party fusion candidates:
  • Joseph L. Pfeifer (1935–1951)
  • Emanuel Celler (1923–1973)
  • Arthur G. Klein (1941–1945, 1946–1956)
  • Adam Clayton Powell Jr. (1945–1971)
• Nonpartisan League members:
  • United States senators:
    • Lynn Frazier (1923–1941)
    • William Langer (1941–1959)
  • United States representatives:
    • John Miller Baer (1917–1921)
    • Usher L. Burdick (1949–1959)
    • William Lemke (1933–1941; 1943–1950)
• Minnesota Farmer–Labor Party members:
  • United States senators:
    • Henrik Shipstead (1923–1941); later became a Republican
    • Magnus Johnson (1923–1925)
    • Elmer Austin Benson (1935–1937)
    • Ernest Lundeen (1937–1940)
  • United States representatives:
    • William Leighton Carss (1919–1921, 1925–1929)
    • Ole J. Kvale (1923–1929)
    • Knud Wefald (1923–1927)
    • Paul John Kvale (1929–1939)
    • Henry M. Arens (1933–1935)
    • Magnus Johnson (1933–1935)
    • Ernest Lundeen (1933–1937); had previously served as a Republican Representative (1915–1917), also served in the Senate
    • Francis Shoemaker (1933–1935)

• Other lists:
  • List of elected socialist mayors in the United States
  • List of Democratic Socialists of America public officeholders
  • List of Green politicians who have held office in the United States (none at federal level)
  • List of Communist Party USA members who have held office in the United States (none at federal level)
• History of the socialist movement in the United States
• Taxation in the United States
• The Squad (United States Congress)
• Congressional Progressive Caucus
• Millennial socialism