Secretaries of the Interior
| No. |
Name |
Term of Office |
President(s) served under |
| 1 | Thomas Ewing | March 8, 1849–July 22, 1850 | Zachary Taylor, Millard Fillmore |
| 2 | Thomas McKean Thompson McKennan | August 15, 1850–August 26, 1850 | Millard Fillmore |
| 3 | Alexander Hugh Holmes Stuart | September 14, 1850–March 7, 1853 | Millard Fillmore |
| 4 | Robert McClelland | March 8, 1853–March 9, 1857 | Franklin Pierce |
| 5 | Jacob Thompson | March 10, 1857–January 8, 1861 | James Buchanan |
| 6 | Caleb Blood Smith | March 5, 1861–December 31, 1862 | Abraham Lincoln |
| 7 | John Palmer Usher | January 1, 1863–May 15, 1865 | Abraham Lincoln |
| 8 | James Harlan | May 16, 1865–August 31, 1866 | Andrew Johnson |
| 9 | Orville Hickman Browning | September 1, 1866–March 4, 1869 | Andrew Johnson |
| 10 | Jacob Dolson Cox | March 5, 1869–October 31, 1870 | Ulysses S. Grant |
| 11 | Columbus Delano | November 1, 1870–September 30, 1875 | Ulysses S. Grant |
| 12 | Zachariah Chandler | October 19, 1875–March 11, 1877 | Ulysses S. Grant |
| 13 | Carl Schurz | March 12, 1877–March 7, 1881 | Rutherford B. Hayes |
| 14 | Samuel J. Kirkwood | March 8, 1881–April 17, 1882 | James A. Garfield, Chester A. Arthur |
| 15 | Henry Moore Teller | April 18, 1882–March 3, 1885 | Chester A. Arthur |
| 16 | L.Q.C. Lamar | March 6, 1885–January 10, 1888 | Grover Cleveland |
| 17 | William Freeman Vilas | January 16, 1888–March 6, 1889 | Grover Cleveland |
| 18 | John Willock Noble | March 7, 1889–March 6, 1893 | Benjamin Harrison |
| 19 | M. Hoke Smith | March 6, 1893–September 1, 1896 | Grover Cleveland |
| 20 | David Rowland Francis | September 3, 1896–March 5, 1897 | Grover Cleveland |
| 21 | Cornelius Newton Bliss | March 6, 1897–February 19, 1899 | William McKinley |
| 22 | Ethan Allen Hitchcock | February 20, 1899–March 4, 1907 | William McKinley, Theodore Roosevelt |
| 23 | James Rudolph Garfield | March 5, 1907–March 5, 1909 | Theodore Roosevelt, William Howard Taft |
| 24 | Richard Achilles Ballinger | March 6, 1909–March 12, 1911 | William Howard Taft |
| 25 | Walter Lowrie Fisher | March 13, 1911–March 5, 1913 | William Howard Taft |
| 26 | Franklin Knight Lane | March 6, 1913–February 29, 1920 | Woodrow Wilson |
| 27 | John Barton Payne | March 15, 1920–March 4, 1921 | Woodrow Wilson |
| 28 | Albert Bacon Fall | March 5, 1921–March 4, 1923 | Warren G. Harding |
| 29 | Hubert Work | March 5, 1923–July 24, 1928 | Warren G. Harding, Calvin Coolidge |
| 30 | Roy Owen West | July 25, 1928–March 4, 1929 | Calvin Coolidge |
| 31 | Ray Lyman Wilbur | March 5, 1929–March 4, 1933 | Herbert Hoover |
| 32 | Harold LeClair Ickes | March 4, 1933–February 15, 1946 | Franklin D. Roosevelt, Harry S. Truman |
| 33 | Julius Albert Krug | March 18, 1946–December 1, 1949 | Harry S. Truman |
| 34 | Oscar Littleton Chapman | December 1, 1949–January 20, 1953 | Harry S. Truman |
| 35 | Douglas McKay | January 21, 1953–April 15, 1956 | Dwight D. Eisenhower |
| 36 | Fred Andrew Seaton | June 8, 1956–January 20, 1961 | Dwight D. Eisenhower |
| 37 | Stewart Lee Udall | January 21, 1961–January 20, 1969 | John F. Kennedy, Lyndon Johnson |
| 38 | Walter J. Hickel | January 24, 1969–November 25, 1970 | Richard Nixon |
| 39 | Rogers Clark Ballard Morton | January 29, 1971–April 30, 1975 | Richard Nixon, Gerald Ford |
| 40 | Stanley K. Hathaway | June 12, 1975–October 9, 1975 | Gerald Ford |
| 41 | Thomas Savig Kleppe | October 17, 1975–January 20, 1977 | Gerald Ford |
| 42 | Cecil D. Andrus | January 23, 1977–January 20, 1981 | Jimmy Carter |
| 43 | James G. Watt | January 23, 1981–November 8, 1983 | Ronald Reagan |
| 44 | William Patrick Clark | November 18, 1983–February 7, 1985 | Ronald Reagan |
| 45 | Donald Paul Hodel | February 8, 1985–January 20, 1989 | Ronald Reagan |
| 46 | Manuel Lujan, Jr. | February 3, 1989–January 20, 1993 | George H. W. Bush |
| 47 | Bruce Babbitt | January 22, 1993–January 2, 2001 | Bill Clinton |
| 48 | Gale Ann Norton | January 31, 2001–March 31, 2006 | George W. Bush |
| 49 | Dirk Kempthorne | May 26, 2006- | George W. Bush |