Names of legislative leaders are followed by their party affiliation and town or county of residence. Note that, before 1974, the lieutenant governor also served as Senate president.
| Session | Senate President | President Pro Tem | Majority Leader | Minority Leader |
| 2011 | Jim Peterson
R-Buffalo | Bruce Tutvedt
R-Kalispell | Jeff Essmann
R-Billings | Carol Williams
D-Missoula |
| 2009 | Robert Story
R-Park City | Dan McGee
R-Laurel | Jim Peterson
R-Buffalo | Carol Williams
D-Missoula |
| 2007 | Mike Cooney
D-Helena | Dan Harrington
D-Butte | Carol Williams
D-Missoula | Corey Stapleton
R-Billings |
| 2005 | Jon Tester
D-Big Sandy | Dan Harrington
D-Butte | Jon Ellingson
D-Missoula | Bob Keenan
R-Bigfork |
| 2003 | Bob Keenan
R-Bigfork | Walter McNutt
R-Sidney | Fred Thomas
R-Stevensville | Jon Tester
D-Big Sandy |
| 2001 | Tom Beck
R-Deer Lodge | Walter McNutt
R-Sidney | Fred Thomas
R-Stevensville | Steve Doherty
D-Great Falls |
| 1999 | Bruce Crippen
R-Billings | Tom Beck
R-Deer Lodge | John Harp
R-Kalispell | Steve Doherty
D-Great Falls |
| 1997 | Gary Aklestad
R-Galata | Bruce Crippen
R-Billings | John Harp
R-Kalispell | Mike Halligan
D-Missoula |
| 1995 | Bob Brown
R-Whitefish | Gary Aklestad
R-Galata | John Harp
R-Kalispell | Mike Halligan
D-Missoula |
| 1993 | Fred Van Valkenburg
D-Missoula | J.D. Lynch
D-Butte | Greg Jergeson
D-Chinook | Bruce Crippen
R-Billings |
| 1991 | Joe Mazurek
D-Helena | J.D. Lynch
D-Butte | Fred Van Valkenburg
D-Missoula | Bruce Crippen
R-Billings |
| 1989 | Jack Galt
R-Martinsdale | Matt Himsl
R-Kalispell | Delwyn Gage
R-Cut Bank | Bill Norman
D-Missoula |
| 1987 | Bill Norman
D-Missoula | George McCallum
R-Niarada | Fred Van Valkenburg
D-Missoula | Gary Aklestad
R-Galata |
| 1985 | Bill Norman
D-Missoula | Chet Blaylock
D-Laurel | Fred Van Valkenburg
D-Missoula | Stan Stephens
R-Havre |
| 1983 | Stan Stephens
R-Havre | Allen Kolstad
R-Chester | Frank Hazelbaker
R-Dillon | Chet Blaylock
D-Laurel |
| 1981 | Jean Turnage
R-Polson | Allen Kolstad
R-Chester | Stan Stephens
R-Havre | Chet Blaylock
D-Laurel |
| Session | Senate President | President Pro Tem | Majority Leader | Minority Leader |
| 1979 | William Mathers
R-Miles City | Allen Kolstad
R-Chester | Stan Stephens
R-Havre | Chet Blaylock
D-Laurel |
| 1977 | W. Gordon McOmber
D-Fairfield | Cornie Thiessen
D-Lambert | Terry Murphy
D-Cardwell | Jean Turnage
R-Polson |
| 1975 | W. Gordon McOmber
D-Fairfield | Carroll Graham
D-Lodge Grass | Neil Lynch
D-Butte | Frank Hazelbaker
R-Dillon |
| 1974 | W. Gordon McOmber
D-Fairfield | P.J. Keenan
D-Anaconda | Neil Lynch
D-Butte | Jim Moore
R-Two Dot |
| 1973 | Bill Christiansen*
D-Hardin | Cornie Thiessen
D-Lambert | Neil Lynch
D-Butte | Jim Moore
R-Two Dot |
| 1971 | Tom Judge
D-Helena | William Hafferman
D-Libby | Dick Dzivi
D-Great Falls | William Mathers
R-Miles City |
| 1969 | Tom Judge
D-Helena | Gordon McGowan
D-Highwood | Eugene Mahoney
D-Thompson Falls | James Haughey
R-Billings |
| 1967 | Ted James
R-Great Falls | Edward Dussault
D-Missoula | Eugene Mahoney
D-Thompson Falls | Jean Turnage
R-Polson |
| 1965 | Ted James
R-Great Falls | Eugene Mahoney
D-Thompson Falls | Edward Dussault
D-Missoula | Sumner Gerard
R-Ennis |
| 1963 | None** | | William Groff
D-Victor | J.S. Brenner
R-Grant |
| 1961 | Tim Babcock
R-Billings | Richard Nixon
D-Hogeland | Richard Nixon
D-Hogeland | |
| 1959 | Paul Cannon
D-Butte | David James
D-Joplin | David James
D-Joplin | Rex Hibbs
R-Billings |
| 1957 | Paul Cannon
D-Butte | David James
D-Joplin | David James
D-Joplin | Donovan Worden
R-Missoula |
| 1955 | George Gosman
R-Beaverhead Co | Glenn Larson
R-Thompson Falls | Glenn Larson
R-Thompson Falls | |
| 1953 | George Gosman
R-Beaverhead Co | Donovan Worden
R-Missoula | Donovan Worden
R-Missoula | |
| 1951 | Paul Cannon
D-Butte | Charles Mahoney
R-Jordan | Charles Mahoney
R-Jordan | |
| Session | Senate President | President Pro Tem | Majority Leader | Minority Leader |
| 1949 | Paul Cannon
D-Butte | G.M. Moss
R-Whitefish | G.M. Moss
R-Whitefish | |
| 1947 | Ernest Eaton
R-Polytechnic | Tom Burke
R-Billings | Tom Burke
R-Billings | |
| 1945 | Ernest Eaton
R-Polytechnic | H.A. Simmons
R-Red Lodge | H.A. Simmons
R-Red Lodge | |
| 1943 | Ernest Eaton
R-Polytechnic | W.E. Keeley
R-Deer Lodge | W.E. Keeley
R-Deer Lodge | |
| 1941 | Ernest Eaton
R-Polytechnic | W.E. Keeley
R-Deer Lodge | | |
| 1939 | Hugh Adair
D-Lewis & Clark Co | Leonard Plank
D-Chester | | |
| 1937 | Hugh Adair
D-Lewis & Clark Co | Leonard Plank
D-Chester | Harry Meyer
D-Butte | |
| 1935 | Ernest Eaton***
R-Polytechnic | W. Elmer Holt
D-Miles City | | |
| 1933 | Frank Cooney
D-Missoula | Tom Kane
R-Corvallis | | |
| 1931 | Frank Hazelbaker
R-Dillon | Tom Kane
R-Corvallis | | |
| 1929 | Frank Hazelbaker
R-Dillon | Tom Kane
R-Corvallis | | |
| 1927 | W.S. McCormack
R-Flathead Co | James Griffin
R-Chinook | | |
| 1925 | W.S. McCormack
R-Flathead Co | Frank Hazelbaker
R-Dillon | | |
| 1923 | Nelson Story, Jr.
R-Gallatin Co | W.E. Harmon
R-Bozeman | | |
| 1921 | Nelson Story, Jr.
R-Gallatin Co | R.P. Heren
R-Miles City | | |
| Session | Senate President | President Pro Tem | Majority Leader | Minority Leader |
| 1919 | W.W. McDowell
D-Silver Bow Co | John Edwards
R-Forsyth | | |
| 1917 | W.W. McDowell
D-Silver Bow Co | John Edwards
R-Forsyth | | |
| 1915 | W.W. McDowell
D-Silver Bow Co | John Edwards
R-Forsyth | | |
| 1913 | W.W. McDowell
D-Silver Bow Co | Charles Muffly
D-Winston | | |
| 1911 | William Allen
R-Deer Lodge | Edward Donlan
R-Missoula | | |
| 1909 | William Allen
R-Deer Lodge | T.M. Everett
R-Harlem | | |
| 1907 | Edwin Norris
D-Beaverhead Co | Benjamin White
R-Dillon | | |
| 1905 | Edwin Norris
D-Beaverhead Co | Benjamin White
R-Dillon | | |
| 1903 | Frank Higgins
D-Missoula | Wesley Biggs
D-Helena | | |
| 1901 | Frank Higgins
D-Missoula | G.H. Stanton
D-Great Falls | | |
| 1899 | Archibald Spriggs
Populist-Meagher Co | Thomas Cullen
D-Glendive | | |
| 1897 | Archibald Spriggs
Populist-Meagher Co | | | |
| 1895 | Alexander Botkin
R-Lewis & Clark Co | | | |
| 1893 | Alexander Botkin
R-Lewis & Clark Co | Elmer Matts
D-Missoula | | |
| 1891 | John Rickards
R-Silver Bow Co | William Thornton
D-Anaconda | | |
| 1889 | John Rickards
R-Silver Bow Co | | | |
| Session | House Speaker | Speaker Pro Tem | Majority Leader | Minority Leader |
| 2011 | Mike Milburn
R-Cascade | Janna Taylor
R-Dayton | Tom McGillvray
R-Billings | Jon Sesso
D-Butte |
| 2009 | Bob Bergren
D-Havre | Franke Wilmer
D-Bozeman | Margarett Campbell
D-Poplar | Scott Sales
R-Bozeman |
| 2007 | Scott Sales
R-Bozeman | Debby Barrett
R-Dillon | Michael Lange
R-Billings | John Parker
D-Great Falls |
| 2005 |
Gary Matthews
D-Miles City |
None
| House Leaders:
Dave Wanzenried
D-Missoula
Roy Brown
R-Billings | Floor Leaders:
Michael Lange
R-Billings
John Parker
D-Great Falls |
| 2003 | Doug Mood
R-Seeley Lake | Jeff Laszloffy
R-Laurel | Roy Brown
R-Billings | Dave Wanzenried
D-Missoula |
| 2001 | Dan McGee
R-Laurel | Doug Mood
R-Seeley Lake | Paul Sliter
R-Somers | Kim Gillan
D-Billings |
| 1999 | John Mercer
R-Polson | Doug Mood
R-Seeley Lake | Larry Grinde
R-Lewistown | Emily Swanson
D-Bozeman |
| 1997 | John Mercer
R-Polson | Marian Hanson
R-Ashland | Larry Grinde
R-Lewistown | Vicki Cocchiarella
D-Missoula |
| 1995 | John Mercer
R-Polson | Marian Hanson
R-Ashland | Larry Grinde
R-Lewistown | Ray Peck
D-Havre |
| 1993 | John Mercer
R-Polson | Marian Hanson
R-Ashland | Larry Grinde
R-Lewistown | Ted Schye
D-Glasgow |
| 1991 | Hal Harper
D-Helena | Dave Brown
D-Butte | Jerry Driscoll
D-Billings | John Mercer
R-Polson |
| 1989 | John Vincent
D-Bozeman | Kelly Addy
D-Billings | Hal Harper
D-Helena | Jack Ramirez
R-Billings |
| 1987 | Bob Marks
R-Clancy | Dennis Iverson
R-Whitlash | Thomas Hannah
R-Billings | John Vincent
D-Bozeman |
| 1985 | John Vincent
D-Bozeman | House Republican Leader:
Bob Marks
Clancy | Hal Harper
D-Helena | Jack Ramirez
R-Billings |
| 1983 | Dan Kemmis
D-Missoula | Joe Brand
D-Deer Lodge | John Vincent
D-Bozeman | Bob Marks
R-Clancy |
| 1981 | Bob Marks
R-Clancy | Art Lund
R-Scobey | Harrison Fagg
R-Billings | Dan Kemmis
D-Missoula |
| Session | House Speaker | Speaker Pro Tem | Majority Leader | Minority Leader |
| 1979 | Harold Gerke
D-Billings | Joe Brand
D-Deer Lodge | Ann Mary Dussault
D-Missoula | Jack Ramirez
R-Billings |
| 1977 | John Driscoll
D-Hamilton | Joe Brand
D-Deer Lodge | Peter "Mike" Meloy
D-Helena | Bob Marks
R-Clancy |
| 1975 | Pat McKittrick
D-Great Falls | Francis Bardanouve
D-Harlem | John Driscoll
D-Hamilton | Lloyd Lockrem, Jr.
R-Billings |
| 1974 | Harold Gerke
D-Billings | None | Larry Fasbender
D-Fort Shaw | Oscar Kvaalen
R-Lambert |
| 1973 | Harold Gerke
D-Billings | Walter Laas
D-Chester | Larry Fasbender
D-Fort Shaw | Oscar Kvaalen
R-Lambert |
| 1971 | James Lucas
R-Miles City | John Pierce
R-Billings | James Harrison, Jr.
R-Helena | Bill Christiansen
D-Hardin |
| 1969 | James Lucas
R-Miles City | Tom Haines
R-Missoula | William Mather
R-Billings | John Hall
D-Great Falls |
| 1967 | James Felt
R-Billings | John Leuthold
R-Molt | James Lucas
R-Miles City | Gordon Twedt
D-Rudyard |
| 1965 | Ray Wayrynen
D-Butte | Gordon Twedt
D-Rudyard | Charles Cerovski
D-Lewistown | James Lucas
R-Miles City |
| 1963 | Frank Hazelbaker
R-Dillon | Fred Broeder, Jr.
R-Kalispell | Alex Blewett, Jr.
R-Great Falls | |
| 1961 | Clyde Hawks
R-St. Xavier | Tom Haines
R-Missoula | Jerome Anderson
R-Billings | |
| 1959 | John MacDonald
D-Jordan | John Emmons
D-Anaconda | Charles Cerovski
D-Lewistown | Sumner Gerard
R-Ennis |
| 1957 | Eugene Mahoney
D-Thompson Falls | John MacDonald
D-Jordan | Fred Barrett
D-Chester | R.F. Juedeman
R-Shelby |
| 1955 | Leo Graybill
D-Great Falls | John Emmons
D-Anaconda | Eugene Mahoney
D-Thompson Falls | |
| 1953 | Dean Chaffin
R-Bozeman | R.H. Gebhardt
R-Billings | R.H. Wiedman
R-Polson | |
| 1951 | Ory Armstrong
R-Kalispell | Leonard Esp
R-Big Timber | Joseph McElwain
R-Deer Lodge | |
| Session | House Speaker | Speaker Pro Tem | Majority Leader | Minority Leader |
| 1949 | Leo Graybill
D-Great Falls | N.A. Peterson
D-Valier | Henry Loble
D-Helena | |
| 1947 | Charles Scofield
R-Biddle | Dean Chaffin
R-Bozeman | Ory Armstrong
R-Kalispell | |
| 1945 | George O'Connor
R-Fromberg | Frank Hazelbaker
R-Missoula | Ralph Bricker
R-Great Falls | David James
D-Joplin |
| 1943 | George O'Connor
R-Fromberg | Neil Parker
R-Bigfork | R.C. Dillavou
R-Billings | Paul Cannon
D-Butte |
| 1941 | E.J. Stromnes
D-Great Falls | Paul Cannon
D-Butte | E.J. Byrne
D-Galata | E.G. Toomey
R-Helena |
| 1939 | D.M. Manning
D-Hysham | Jasper DeDobbeleer
D-Glasgow | Archie McLeod
D-Great Falls | Ben Miles
R-McLeod |
| 1937 | H.D. Rolph
D-Joplin | George Monahan
D-Livingston | Sam Spiegel
D-Butte | |
| 1935 | W.P. Pilgeram
D-Armington | H.D. Rolph
D-Joplin | E.J. Byrne
D-Galata | |
| 1933 | Dennis Dellwo
D-Charlo | Herbert Haight
D-Suffolk | Albert Besancon
D-Missoula | |
| 1931 | W.R. Flachsenhar
R-Terry | Steve Arnold
R-Broadview | W.B. Leavitt
R-Miles City | |
| 1929 | Ralph Bricker
R-Windham | Elmer Johnson
R-Glasgow | W.R. Flachsenhar
R-Terry | |
| 1927 | Glenn Davis
R-Carlyle | G.M. Moss
R-Whitefish | Ralph Bricker
R-Windham | |
| 1925 | Ralph Bricker
R-Windham | C.F. Holt
R-Great Falls | William Ruffcorn
R-Glasgow | |
| 1923 | Calvin Crumbaker
R-Fort Benton | A.O. Gullidge
R-Terry | Charles Swift
R-Hysham | |
| 1921 | Fred Gibson
R-Livingston | Percy Dodds
R-Whitefish | Edward Johnson
R-Anaconda | |
| Session | House Speaker | Speaker Pro Tem | Majority Leader | Minority Leader |
| 1919 | O.W. Belden
R-Lewistown | Ronald Higgins
R-Missoula | | |
| 1917 | Jas. F. O'Connor
D-Livingston | Thomas Kehoe
D-Billings | | |
| 1915 | George Ramsey
D-Helena | J.E. McNally
D-Butte | | |
| 1913 | Alexander MacDonald
D-Kalispell | Joseph Kirschwing
D-Great Falls | | |
| 1911 | W.W. McDowell
D-Butte | R. Lee Word
D-Helena | | |
| 1909 | W.W. McDowell
D-Butte | Edward Burke
D-Anaconda | | |
| 1907 | E.W. King
R-Bozeman | W.R. Allen
R-Anaconda | | |
| 1905 | Wyllis Hedges
R-Fergus Co | Marcus Hewett
R-Basin | | |
| 1903 | Benjamin White
R-Dillon | Aaron Conner
R-Darby | | |
| 1901 | Frank Corbett
D-Butte | John Baker
D-Helena | | |
| 1899 | Henry Stiff
D-Missoula | Edwin Lamb
D-Silver Bow Co | | |
| 1897 | Jacob Kennedy
D-Deer Lodge Co | | | |
| 1895 | Wilbra Swett
R-Silver Bow Co | | | |
| 1893 | Thomas Matthews
Populist-Silver Bow Co | A.F. Bray
Populist-Butte City | | |
| 1891 | Harry Comly
D-Lewis & Clark Co | R.G. Humber
D-Deer Lodge Co | | |
| 1889 | Charles Blakely****
D-Gallatin Co
Aaron Witter
R-Beaverhead Co | | | |
