| Associate Justice |
Term served |
Notes |
| William H. DeWitt |
(1889–1897) |
|
| Edgar N. Harwood |
(1889–1895) |
|
| William Henry Hunt |
(1895–1900) |
Resigned |
| Horace R. Buck |
(1897) |
Died in office |
| William Trigg Pigott |
(1897–1903) |
Appointed |
| Robert L. Word |
(1900–1901) |
Appointed |
| George R. Milburn |
(1901–1907) |
|
| William L. Holloway |
(1903–1926) |
Died in office |
| Henry C. Smith |
(1907–1913) |
|
| Sydney Sanner |
(1913–1918) |
|
| William Trigg Pigott |
(1918) |
Appointed; previously served as Associate Justice, 1897–1903 |
| Charles H. Cooper |
(1919–1924) |
Resigned |
| John Hurly |
(1919–1921) |
|
| George Y. Patten |
(1919) |
Appointed to newly created seat; resigned |
| John A. Matthews |
(1919–1920) |
Appointed; subsequently served as Associate Justice, 1925–1937 |
| Roy E. Ayers |
(1922) |
Appointed to newly created seat, January 1922; resigned November 22, 1922 |
| Albert J. Galen |
(1921–1933) |
|
| Frank B. Reynolds |
(1921–1922) |
Died in office |
| George W. Farr |
(1922–1923) |
Appointed |
| Albert P. Stark |
(1923–1929) |
|
| Wellington D. Rankin |
(1924–1925) |
Appointed |
| John A. Matthews |
(1925–1937) |
Previously served as Associate Justice, 1919 |
| Warren Toole |
(1926–1927) |
Appointed |
| Henry L. Myers |
(1927–1929) |
Appointed |
| Albert H. Angstman |
(1929–1934) |
Subsequently served as Associate Justice 1937–1942, 1945–1961 for a total of 28 years |
| Sam C. Ford |
(1929–1933) |
Subsequently, Governor of Montana, 1941 to 1949 |
| Ralph J. Anderson |
(1933–1939) |
|
| Sam V. Stewart |
(1933–1939) |
Previously Governor of Montana, 1913–1921; State Representative, 1931–1933; died in office, 1939 |
| Claude F. Morris |
(1935–1947) |
|
| Albert H. Angstman |
(1937–1942) |
Previously served as Associate Justice, 1929–1934; subsequently served 1945–1961 |
| Ralph L. Arnold |
(1939–1941) |
Appointed |
| Leif Erickson |
(1939–1945) |
|
| Albert Anderson |
(1941–1945) |
|
| Hugh R. Adair |
(1943–1946) |
Subsequently served as Chief Justice, 1947–1956, and again as Associate Justice 1957 – 1968 |
| Albert H. Angstman |
(1945–1961) |
Previously served as Associate Justice, 1929–1934, and 1945–1961 |
| Edwin K. Cheadle |
(1945–1947) |
Resigned |
| I. W. Choate |
(1947–1949) |
Appointed |
| Fred L. Gibson |
(1947–1948) |
Appointed |
| Lee Metcalf |
(1947–1953) |
Subsequently, U.S. Representative, 1953–1961; U.S. Senator, 1961–1978 |
| R. V. Bottomly |
(1949–1961) |
|
| Harrison J. Freebourn |
(1949–1954) |
|
| Forrest H. Anderson |
(1953–1956) |
Subsequently served as Governor of Montana, 1969–1973 |
| Horace S. Davis |
(1954–1957) |
Appointed |
| Hugh R. Adair |
(1957–1968) |
Previously served as Associate Justice, 1943–1946 and as Chief Justice, 1947–1956 |
| Wesley Castles |
(1957–1977) |
Appointed |
| Stanley M. Doyle |
(1961–1967) |
Appointed; resigned |
| John C. Harrison |
(1961–1994) |
Longest serving justice in history of the court |
| Frank I. Haswell |
(1967–1978) |
Appointed; subsequently served as Chief Justice, 1978–1985 |
| John W. Bonner |
(1969–1970) |
Previously Governor of Montana, 1949 to 1953; Died in office, 1970 |
| Gene B. Daly |
(1970–1983) |
Appointed, reelected |
| Daniel J. Shea |
(1977–1985) |
|
| John C. Sheehy |
(1978–1991) |
Appointed |
| Frank B. Morrison |
(1981–1987) |
Resigned |
| Fred J. Weber |
(1981–1995) |
|
| L. C. Gulbrandson |
(1983–1989) |
| William E. Hunt |
(1985–2000) |
|
| R. C. McDonough |
(1987–1993) |
|
| Diane Barz |
(1989–1990) |
First woman to serve on the court; resigned |
| Terry N. Trieweiler |
(1991–2003) |
|
| Karla M. Gray |
(1991–2000) |
Subsequently served as Chief Justice, 2000 to 2008 |
| Charles E. Erdmann |
(1995–1997) |
|
| Jim Regnier |
(1997–2004) |
|
| John Warner |
(2003–2009) |
|
| W. William Leaphart |
(1995–2010) |
Elected 1994; re-elected 2002 |
|
| James C. Nelson |
(1993–2012) |
Appointed by Governor Marc Racicot; elected 1994; re-elected 1996, 2004 |
| Brian Matthew Morris |
(2005–2013) |
Elected 2004; re-elected 2012 |
| Patricia O'Brien Cotter |
(2001–2016) |
Elected 2000; re-elected 2008 |
| Mike Wheat |
(2010–2017) |
Elected in 2010; re-elected 2014 |
| Dirk Sandefur |
(2017–2025) |
Elected in 2016 |
