List of United States senators from Montana

Montana was admitted to the Union on November 8, 1889, and elects U.S. senators to classes 1 and 2. Its current U.S. senators are Democrat Jon Tester (serving since 2007) and Republican Steve Daines (serving since 2015), making it one of five states to have a United States Senate delegation split between Republican and Democratic caucusing senators. Max Baucus is the state's longest serving senator, serving from 1978 to 2014.

List of senators

 * - style="height:2em"
 * colspan=3 | Vacant
 * nowrap | Nov 8, 1889 – Jan 1, 1890
 * Montana elected its first senators two months after admission to the Union.
 * rowspan=3 | 1
 * rowspan=2
 * rowspan=5 | 1
 * Montana elected its first senators two months after admission to the Union.
 * nowrap | Nov 8, 1889 – Jan 2, 1890
 * colspan=3 | Vacant

! rowspan=2 | 1 ! rowspan=4 | 1
 * - style="height:2em"
 * rowspan=2 align=left | Wilbur Fisk Sanders.jpg Wilbur F. Sanders
 * rowspan=2 | Republican
 * rowspan=2 nowrap | Jan 1, 1890 – Mar 3, 1893
 * rowspan=2 | Elected in 1890.Lost re-election.
 * rowspan=4 | Elected in 1890.Retired.
 * rowspan=4 nowrap | Jan 2, 1890 – Mar 3, 1895
 * rowspan=4 | Republican
 * rowspan=4 align=right | ThomasCPower.jpg Thomas C. Power


 * - style="height:2em"


 * - style="height:2em"
 * colspan=3 | Vacant
 * nowrap | Mar 3, 1893 – Jan 16, 1895
 * Legislature failed to elect.
 * rowspan=4 | 2
 * rowspan=2

! rowspan=3 | 2
 * - style="height:2em"
 * rowspan=3 align=left | Lee Mantle U.S. Senator from Montana (1895) by James Presley Ball (Detail).jpg Lee Mantle
 * rowspan=2 | Republican
 * rowspan=3 nowrap | Jan 16, 1895 – Mar 3, 1899
 * rowspan=3 | Elected to finish vacant term.Lost renomination.

! rowspan=4 | 2
 * - style="height:2em"
 * rowspan=4 | 2
 * rowspan=4 | Elected in Jan 1895. Lost re-election.
 * rowspan=4 nowrap | Mar 4, 1895 – Mar 3, 1901
 * rowspan=4 | Republican
 * rowspan=4 align=right | Thomas Henry Carter cph.3b27384.jpg Thomas H. Carter
 * rowspan=4 align=right | Thomas Henry Carter cph.3b27384.jpg Thomas H. Carter


 * - style="height:2em"
 * | Silver Republican

! 3
 * - style="height:2em"
 * align=left | Waclark.jpg William Clark
 * | Democratic
 * nowrap | Mar 4, 1899 – May 15, 1900
 * Elected in 1899.Resigned to avoid claim of election fraud.
 * rowspan=5 | 3
 * rowspan=2


 * - style="height:2em"
 * rowspan=2 colspan=3 | Vacant
 * rowspan=2 nowrap | May 15, 1900 – Mar 7, 1901
 * rowspan=2 | Clark was appointed to continue his term, but did not qualify.

! rowspan=4 | 3
 * - style="height:2em"
 * rowspan=2
 * rowspan=4 | 3
 * rowspan=4 | Elected in 1901.Retired.
 * rowspan=4 nowrap | Mar 4, 1901 – Mar 3, 1907
 * rowspan=4 | Democratic
 * rowspan=4 align=right | Waclark.jpg William Clark

! rowspan=2 | 4
 * - style="height:2em"
 * rowspan=2 align=left | Paris Gibson.jpg Paris Gibson
 * rowspan=2 | Democratic
 * rowspan=2 nowrap | Mar 7, 1901 – Mar 3, 1905
 * rowspan=2 | Elected to finish Clark's term. Retired.


 * - style="height:2em"

! rowspan=3 | 5
 * - style="height:2em"
 * rowspan=3 align=left | Portrait of Thomas H. Carter.jpg Thomas H. Carter
 * rowspan=3 | Republican
 * rowspan=3 nowrap | Mar 4, 1905 – Mar 3, 1911
 * rowspan=3 | Elected Jan 16, 1905. Lost re-election.
 * rowspan=3 | 4

! rowspan=3 | 4
 * - style="height:2em"
 * rowspan=3 | 4
 * rowspan=3 | Elected Jan 16, 1907. Lost re-election as a Progressive.
 * rowspan=3 nowrap | Mar 4, 1907 – Mar 3, 1913
 * rowspan=3 | Republican
 * rowspan=3 align=right | Joseph M. Dixon.jpg Joseph M. Dixon
 * rowspan=3 align=right | Joseph M. Dixon.jpg Joseph M. Dixon


 * - style="height:2em"

! rowspan=6 | 6
 * - style="height:2em"
 * rowspan=6 align=left | Henry L. Myers cph.3b15990.jpg Henry L. Myers
 * rowspan=6 | Democratic
 * rowspan=6 nowrap | Mar 4, 1911 – Mar 3, 1923
 * rowspan=3 | Elected Mar 2, 1911.
 * rowspan=3 | 5

! rowspan=10 | 5
 * - style="height:2em"
 * rowspan=3 | 5
 * rowspan=3 | Elected Jan 14, 1913.
 * rowspan=10 nowrap | Mar 4, 1913 – Mar 2, 1933
 * rowspan=10 | Democratic
 * rowspan=10 align=right | Thomas J. Walsh cph.3c02581.jpg Thomas J. Walsh
 * rowspan=10 align=right | Thomas J. Walsh cph.3c02581.jpg Thomas J. Walsh


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=3 | Re-elected in 1916.Retired.
 * rowspan=3 | 6


 * - style="height:2em"
 * rowspan=3 | 6
 * rowspan=3 | Re-elected in 1918.
 * rowspan=3 | Re-elected in 1918.


 * - style="height:2em"

! rowspan=15 | 7
 * - style="height:2em"
 * rowspan=15 align=left | BurtonKWheeler.jpg Burton K. Wheeler
 * rowspan=15 | Democratic
 * rowspan=15 nowrap | Mar 4, 1923 – Jan 3, 1947
 * rowspan=3 | Elected in 1922.
 * rowspan=3 | 7


 * - style="height:2em"
 * rowspan=3 | 7
 * rowspan=3 | Re-elected in 1924.
 * rowspan=3 | Re-elected in 1924.


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=6 | Re-elected in 1928.
 * rowspan=6 | 8


 * - style="height:2em"
 * rowspan=2
 * rowspan=6 | 8
 * Re-elected in 1930.Died.


 * - style="height:2em"
 * rowspan=2 |
 * rowspan=2 nowrap | Mar 2, 1933 – Mar 13, 1933
 * rowspan=2 colspan=3 | Vacant


 * - style="height:2em"
 * rowspan=3

! 6
 * - style="height:2em"
 * Appointed to continue Walsh's term.Lost nomination to finish Walsh's term.
 * nowrap | Mar 13, 1933 – Nov 6, 1934
 * | Democratic
 * align=right | John Erickson.jpg John E. Erickson

! rowspan=14 | 7
 * - style="height:2em"
 * rowspan=2 | Elected to finish Walsh's term.
 * rowspan=14 nowrap | Nov 7, 1934 – Jan 3, 1961
 * rowspan=14 | Democratic
 * rowspan=14 align=right | M001108.jpg James E. Murray


 * - style="height:2em"
 * rowspan=3 | Re-elected in 1934.
 * rowspan=3 | 9


 * - style="height:2em"
 * rowspan=3 | 9
 * rowspan=3 | Re-elected in 1936.
 * rowspan=3 | Re-elected in 1936.


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=3 | Re-elected in 1940.Lost renomination.
 * rowspan=3 | 10


 * - style="height:2em"
 * rowspan=3 | 10
 * rowspan=3 | Re-elected in 1942.
 * rowspan=3 | Re-elected in 1942.


 * - style="height:2em"

! rowspan=3 | 8
 * - style="height:2em"
 * rowspan=3 align=left | Zales Nelson Ecton.jpg Zales Ecton
 * rowspan=3 | Republican
 * rowspan=3 nowrap | Jan 3, 1947 – Jan 3, 1953
 * rowspan=3 | Elected in 1946.Lost re-election.
 * rowspan=3 | 11


 * - style="height:2em"
 * rowspan=3 | 11
 * rowspan=3 | Re-elected in 1948.
 * rowspan=3 | Re-elected in 1948.


 * - style="height:2em"

! rowspan=12 | 9
 * - style="height:2em"
 * rowspan=12 align=left | Michael Joseph Mansfield.jpg Mike Mansfield
 * rowspan=12 | Democratic
 * rowspan=12 nowrap | Jan 3, 1953 – Jan 3, 1977
 * rowspan=3 | Elected in 1952.
 * rowspan=3 | 12


 * - style="height:2em"
 * rowspan=3 | 12
 * rowspan=3 | Re-elected in 1954.Retired.
 * rowspan=3 | Re-elected in 1954.Retired.


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=3 | Re-elected in 1958.
 * rowspan=3 | 13

! rowspan=9 | 8
 * - style="height:2em"
 * rowspan=3 | 13
 * rowspan=3 | Elected in 1960.
 * rowspan=9 nowrap | Jan 3, 1961 – Jan 12, 1978
 * rowspan=9 | Democratic
 * rowspan=9 align=right | Lee Warren METCALF.jpg Lee Metcalf
 * rowspan=9 align=right | Lee Warren METCALF.jpg Lee Metcalf


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=3 | Re-elected in 1964.
 * rowspan=3 | 14


 * - style="height:2em"
 * rowspan=3 | 14
 * rowspan=3 | Re-elected in 1966.
 * rowspan=3 | Re-elected in 1966.


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=3 | Re-elected in 1970.Retired.
 * rowspan=3 | 15


 * - style="height:2em"
 * rowspan=7 | 15
 * rowspan=3 | Re-elected in 1972.Died.
 * rowspan=3 | Re-elected in 1972.Died.


 * - style="height:2em"

! rowspan=10 | 10
 * - style="height:2em"
 * rowspan=10 align=left | John Melcher.jpg John Melcher
 * rowspan=10 | Democratic
 * rowspan=10 nowrap | Jan 3, 1977 – Jan 3, 1989
 * rowspan=7 | Elected in 1976.
 * rowspan=7 | 16
 * rowspan=5


 * - style="height:2em"
 * nowrap | Jan 12, 1978 – Jan 22, 1978
 * colspan=3 | Vacant
 * colspan=3 | Vacant

! 9
 * - style="height:2em"
 * Appointed to finish Metcalf's term.Lost nomination to full term.Resigned early to give successor preferential seniority.
 * nowrap | Jan 22, 1978 – Dec 14, 1978
 * | Democratic
 * align=right | Paul G. Hatfield.jpg Paul G. Hatfield


 * - style="height:2em"
 * nowrap | Dec 14, 1978 – Dec 15, 1978
 * colspan=3 | Vacant
 * colspan=3 | Vacant

! rowspan=19 | 10
 * - style="height:2em"
 * Appointed early to finish Metcalf's term, having already been elected to the next term.
 * rowspan=19 nowrap | Dec 15, 1978 – Feb 6, 2014
 * rowspan=19 | Democratic
 * rowspan=19 align=right | Max S Baucus.jpg Max Baucus


 * - style="height:2em"
 * rowspan=3 | 16
 * rowspan=3 | Elected in 1978.
 * rowspan=3 | Elected in 1978.


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=3 | Re-elected in 1982.Lost re-election.
 * rowspan=3 | 17


 * - style="height:2em"
 * rowspan=3 | 17
 * rowspan=3 | Re-elected in 1984.
 * rowspan=3 | Re-elected in 1984.


 * - style="height:2em"

! rowspan=9 | 11
 * - style="height:2em"
 * rowspan=9 align=left | Conrad Burns official portrait.jpg Conrad Burns
 * rowspan=9 | Republican
 * rowspan=9 nowrap | Jan 3, 1989 – Jan 3, 2007
 * rowspan=3 | Elected in 1988.
 * rowspan=3 | 18


 * - style="height:2em"
 * rowspan=3 | 18
 * rowspan=3 | Re-elected in 1990.
 * rowspan=3 | Re-elected in 1990.


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=3 | Re-elected in 1994.
 * rowspan=3 | 19


 * - style="height:2em"
 * rowspan=3 | 19
 * rowspan=3 | Re-elected in 1996.
 * rowspan=3 | Re-elected in 1996.


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=3 | Re-elected in 2000.Lost re-election.
 * rowspan=3 | 20


 * - style="height:2em"
 * rowspan=3 | 20
 * rowspan=3 | Re-elected in 2002.
 * rowspan=3 | Re-elected in 2002.


 * - style="height:2em"

! rowspan=11 | 12
 * - style="height:2em"
 * rowspan=11 align=left | Jon Tester, official 110th Congress photo.jpg Jon Tester
 * rowspan=11 | Democratic
 * rowspan=11 nowrap | Jan 3, 2007 – present
 * rowspan=3 | Elected in 2006.
 * rowspan=3 | 21


 * - style="height:2em"
 * rowspan=5 | 21
 * rowspan=3 | Re-elected in 2008.Announced retirement, then resigned to become U.S. Ambassador to China.
 * rowspan=3 | Re-elected in 2008.Announced retirement, then resigned to become U.S. Ambassador to China.


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=5 | Re-elected in 2012.
 * rowspan=5 | 22
 * rowspan=3


 * - style="height:2em"
 * nowrap | Feb 6, 2014 – Feb 9, 2014
 * colspan=3 | Vacant
 * colspan=3 | Vacant

! 11
 * - style="height:2em"
 * Appointed to finish Baucus's term.Ran for election to full term, but withdrew.
 * nowrap | Feb 9, 2014 – Jan 3, 2015
 * | Democratic
 * align=right | John Walsh, official portrait, 113th Congress.jpg John Walsh

! rowspan=6 | 12
 * - style="height:2em"
 * rowspan=3 | 22
 * rowspan=3 | Elected in 2014.
 * rowspan=6 nowrap | Jan 3, 2015 – present
 * rowspan=6 | Republican
 * rowspan=6 align=right | Steve Daines official Senate portrait.jpg Steve Daines
 * rowspan=6 align=right | Steve Daines official Senate portrait.jpg Steve Daines


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=3 | Re-elected in 2018.
 * rowspan=3 | 23


 * - style="height:2em"
 * rowspan=3 | 23
 * rowspan=3 |Re-elected in 2020.
 * rowspan=3 |Re-elected in 2020.


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=2 colspan=5 | To be determined in the 2024 election.
 * rowspan=2|23


 * - style="height:2em"
 * 24
 * colspan=5 | To be determined in the 2026 election.
 * colspan=5 | To be determined in the 2026 election.