The members of the 12th Manitoba Legislature were elected in the Manitoba general election held in March 1907. The legislature sat from January 2, 1908, to June 30, 1910.

The Conservatives led by Rodmond Roblin formed the government.

Charles Mickle of the Liberal Party served as Leader of the Opposition. After Mickle was named a judge in 1909, Tobias Norris became party leader and leader of the opposition.

James Johnson served as speaker for the assembly.

There were three sessions of the 12th Legislature: SessionStartEnd 1st January 2, 1908 February 26, 1908 2nd February 4, 1909 March 10, 1909 3rd February 10, 1910 March 16, 1910

Daniel Hunter McMillan was Lieutenant Governor of Manitoba.

Members of the Assembly The following members were elected to the assembly in 1907: MemberElectoral districtPartyFirst elected / previously electedNo.# of term(s)John WilliamsArthurLiberal19071st termAimé BénardAssiniboiaConservative19071st termJames ArgueAvondaleConservative18993rd termJames H. HowdenBeautiful PlainsConservative19032nd termCharles MickleBirtleLiberal18886th termGeorge Malcolm (1909)Liberal19091st termStanley McInnisBrandon CityConservative18993rd termGeorge R. Coldwell (1907)Conservative19071st termAlfred CarrollBrandon SouthConservative19032nd termAlbert PrefontaineCarillonConservative19032nd termGeorge SteelCypressConservative18993rd termJohn A. CampbellDauphinLiberal19071st termRobert Stirton ThorntonDeloraineLiberal19071st termRodmond RoblinDufferinConservative1888, 18966th term*George WaltonEmersonLiberal19071st termGlenlyon CampbellGilbert PlainsConservative19032nd termDuncan Cameron (1908)Conservative19081st termSigtryggur JonassonGimliLiberal1896, 19072nd term*James William ArmstrongGladstoneLiberal19071st termWilliam FergusonHamiotaConservative1899, 19072nd term*Orton GrainKildonan and St. AndrewsConservative1899, 19072nd term*George LawrenceKillarneyConservative18993rd termEdwin D. LynchLakesideConservative19032nd termTobias NorrisLansdowneLiberal1896, 19073rd term*Jean LauzonLa VerendryeConservative1897, 19072nd term*Robert RogersManitouConservative18993rd termWilliam B. WaddellMinnedosaConservative19032nd termBenjamin McConnellMordenLiberal19071st termColin CampbellMorrisConservative18993rd termJames Bryson BairdMountainLiberal19071st termRobert Fern LyonsNorfolkConservative1892, 18994th term*Hugh ArmstrongPortage la PrairieConservative1892, 19024th term*Valentine WinklerRhinelandLiberal18925th termIsaac RileyRockwoodConservative18993rd termAngus BonnycastleRussellConservative19071st termJoseph BernierSt. BonifaceConservative1900, 19072nd term*Donald A. RossSpringfieldLiberal19071st termJames Wells RobsonSwan RiverConservative19032nd termJames JohnsonTurtle MountainConservative18974th termJohn Hume AgnewVirdenConservative19032nd termHarvey Simpson (1909)Conservative19091st termThomas William TaylorWinnipeg CentreConservative19003rd termJohn F. MitchellWinnipeg NorthConservative19071st termJames Thomas GordonWinnipeg SouthConservative19013rd termThomas Herman JohnsonWinnipeg WestLiberal19071st term

Notes:

By-elections By-elections were held to replace members for various reasons: Electoral districtMember electedAffiliationElection dateReasonBeautiful PlainsJames H. HowdenConservativeMarch 26, 1907J H Howden appointed Railway CommissionerBrandon CityStanley McInnisConservativeJuly 16, 1907S McInnis appointed Provincial SecretaryBrandon CityGeorge R. ColdwellConservativeNovember 25, 1907S McInnis died November 4, 1907Gilbert PlainsDuncan CameronConservativeNovember 17, 1908G Campbell ran for federal seatPortage la PrairieHugh ArmstrongConservativeNovember 30, 1908H Armstrong appointed Provincial TreasurerVirdenHarvey SimpsonConservativeJanuary 9, 1909J H Agnew died November 9, 1908BirtleGeorge MalcolmLiberalNovember 27, 1909C Mickle named judge in 1909

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