List of United States senators from Oregon

Oregon was admitted to the Union on February 14, 1859. Its current U.S. senators are Democrats Ron Wyden (serving since 1996) and Jeff Merkley (serving since 2009). Wyden is Oregon's longest-serving senator.

Before 1906, U.S. senators were elected by the Oregon Legislative Assembly. In 1904, Oregon voters passed a ballot measure that required U.S. senators to be selected by a popular vote and then endorsed by the state legislature. Beginning in 1914, U.S. senators were directly elected by popular vote based on the 17th Amendment to the United States Constitution.

List of senators

|- style="height:2em"

! 1

| align=left | 100px Delazon Smith

| | Democratic

| nowrap | Feb 14, 1859 – Mar 3, 1859

| Elected in 1859.Lost re-election.

| 1

| rowspan=3 | 1

| rowspan=3 | Elected in 1859.Retired.

| rowspan=3 nowrap | Feb 14, 1859 – Mar 3, 1861

| rowspan=3 | Democratic

| rowspan=3 align=right | 100px Joseph Lane

! rowspan=3 | 1

|- style="height:2em"

| colspan=3 | Vacant

| nowrap | Mar 3, 1859 – Oct 1, 1860

| Legislature failed to elect.

| rowspan=7 | 2

| rowspan=2

|- style="height:2em"

! rowspan=2 | 2

| rowspan=2 align=left | 100px Edward D. Baker

| rowspan=2 | Republican

| rowspan=2 nowrap | Oct 1, 1860 – Oct 21, 1861

| rowspan=2 | Elected late in 1860.Died.

|- style="height:2em"

| rowspan=4

| rowspan=6 | 2

| rowspan=6 | Election year unknown.Lost re-election.

| rowspan=6 nowrap | Mar 4, 1861 – Mar 3, 1867

| rowspan=6 | Democratic

| rowspan=6 align=right | 100px James Nesmith

! rowspan=6 | 2

|- style="height:2em"

| colspan=3 | Vacant

| nowrap | Oct 21, 1861 – Feb 27, 1862

|- style="height:2em"

! 3

| align=left | 100px Benjamin Stark

| | Democratic

| nowrap | Feb 27, 1862 – Sep 12, 1862

| Appointed to continue Baker's term.Retired when successor elected.

|- style="height:2em"

! rowspan=2 | 4

| rowspan=2 align=left | 100px Benjamin F. Harding

| rowspan=2 | Union

| rowspan=2 nowrap | Sep 12, 1862 – Mar 3, 1865

| rowspan=2 | Elected to finish Baker's term.Retired.

|- style="height:2em"

! rowspan=3 | 5

| rowspan=3 align=left | 100px George H. Williams

| rowspan=3 | Republican

| rowspan=3 nowrap | Mar 4, 1865 – Mar 3, 1871

| rowspan=3 | Elected in 1864.Lost re-election.

| rowspan=3 | 3

|- style="height:2em"

| rowspan=3 | 3

| rowspan=3 | Election year unknown.Retired.

| rowspan=3 nowrap | Mar 4, 1867 – Mar 3, 1873

| rowspan=3 | Republican

| rowspan=3 align=right | 100px Henry W. Corbett

! rowspan=3 | 3

|- style="height:2em"

! rowspan=3 | 6

| rowspan=3 align=left | 100px James K. Kelly

| rowspan=3 | Democratic

| rowspan=3 nowrap | Mar 4, 1871 – Mar 3, 1877

| rowspan=3 | Elected in 1870.Retired.

| rowspan=3 | 4

|- style="height:2em"

| rowspan=3 | 4

| rowspan=3 | Elected in 1872.Lost re-election.

| rowspan=3 nowrap | Mar 4, 1873 – Mar 3, 1879

| rowspan=3 | Republican

| rowspan=3 align=right | 100px John H. Mitchell

! rowspan=3 | 4

|- style="height:2em"

! rowspan=3 | 7

| rowspan=3 align=left | 100px La Fayette Grover

| rowspan=3 | Democratic

| rowspan=3 nowrap | Mar 4, 1877 – Mar 3, 1883

| rowspan=3 | Election year unknown.Retired.

| rowspan=3 | 5

|- style="height:2em"

| rowspan=3 | 5

| rowspan=3 | Election year unknown.Retired.

| rowspan=3 nowrap | Mar 4, 1879 – Mar 3, 1885

| rowspan=3 | Democratic

| rowspan=3 align=right | 100px James H. Slater

! rowspan=3 | 5

|- style="height:2em"

! rowspan=7 | 8

| rowspan=7 align=left | 100px Joseph N. Dolph

| rowspan=7 | Republican

| rowspan=7 nowrap | Mar 4, 1883 – Mar 3, 1895

| rowspan=4 | Elected in 1882.

| rowspan=4 | 6

|- style="height:2em"

| rowspan=2

| rowspan=4 | 6

| nowrap | Mar 3, 1885 – Nov 18, 1885

| colspan=3 | Vacant

|- style="height:2em"

| rowspan=3 | Elected late in 1885.

| rowspan=6 nowrap | Nov 18, 1885 – Mar 3, 1897

| rowspan=6 | Republican

| rowspan=6 align=right | 100px John H. Mitchell

! rowspan=6 | 6

|- style="height:2em"

| rowspan=3 | Re-elected in 1888.Lost re-election.

| rowspan=3 | 7

|- style="height:2em"

| rowspan=3 | 7

| rowspan=3 | Re-elected in 1890.Lost re-election.

|- style="height:2em"

! rowspan=4 | 9

| rowspan=4 align=left | 100px George W. McBride

| rowspan=4 | Republican

| rowspan=4 nowrap | Mar 4, 1895 – Mar 3, 1901

| rowspan=4 | Elected in 1895.Lost renomination.

| rowspan=4 | 8

|- style="height:2em"

| rowspan=2

| rowspan=4 | 8

| nowrap | Mar 3, 1897 – Oct 7, 1898

| colspan=3 | Vacant

|- style="height:2em"

| rowspan=3 | Elected late in 1898.Retired.

| rowspan=3 nowrap | Oct 7, 1898 – Mar 3, 1903

| rowspan=3 | Republican

| rowspan=3 align=right | 100px Joseph Simon

! rowspan=3 | 7

|- style="height:2em"

! rowspan=3 | 10

| rowspan=3 align=left | 100px John H. Mitchell

| rowspan=3 | Republican

| rowspan=3 nowrap | Mar 4, 1901 – Dec 8, 1905

| rowspan=3 | Elected in 1901.Died.

| rowspan=6 | 9

|- style="height:2em"

| rowspan=6 | 9

| rowspan=6 | Elected in 1903.Lost re-election.

| rowspan=6 nowrap | Mar 4, 1903 – Mar 3, 1909

| rowspan=6 | Republican

| rowspan=6 align=right | 100px Charles W. Fulton

! rowspan=6 | 8

|- style="height:2em"

| rowspan=4

|- style="height:2em"

| colspan=3 | Vacant

| nowrap | Dec 8, 1905 – Dec 21, 1905

|- style="height:2em"

! 11

| align=left | 100px John M. Gearin

| | Democratic

| nowrap | Dec 21, 1905 – Jan 23, 1907

| Appointed to continue Mitchell's term.Retired when successor elected.

|- style="height:2em"

! 12

| align=left | 100px Frederick W. Mulkey

| | Republican

| nowrap | Jan 23, 1907 – Mar 3, 1907

| Elected to finish Mitchell's term.Retired.

|- style="height:2em"

! rowspan=3 | 13

| rowspan=3 align=left | 100px Jonathan Bourne Jr.

| rowspan=3 | Republican

| rowspan=3 nowrap | Mar 4, 1907 – Mar 3, 1913

| rowspan=3 | Elected in 1907.

| rowspan=17 align=right | 100px Wayne Morse

! rowspan=17 | 15

|- style="height:2em"

| rowspan=4 | Re-elected in 1948.Lost re-election.

| rowspan=4 | 17

|- style="height:2em"

| rowspan=2

| rowspan=4 | 17

| rowspan=4 | Re-elected in 1950.

|- style="height:2em"

| rowspan=2 | Independent