The Second Parliament of Ontario was in session from March 21, 1871, until December 23, 1874, just prior to the 1875 general election.
The majority party was the Ontario Liberal Party led by Edward Blake, whose Cabinet succeeded as Government when incumbent John Sandfield Macdonald and his Patent Combination Ministry fell December 20, 1871; Oliver Mowat replaced Blake as premier in October 25, 1872, after an act was passed by the Ontario Parliament which prohibited a member from holding a seat in the Legislative Assembly while holding a seat in the Dominion Parliament, a so-called "dual mandate".
Blake chose to serve as federal Leader of the Opposition instead of remaining as Premier.
Richard William Scott served as speaker for the assembly until he was named to cabinet on December 21, 1871.
James George Currie succeeded Scott as speaker, serving until his resignation on March 29, 1873.