13th Parliament of Ontario
The 13th Legislative Assembly of Ontario was in session from December 11, 1911, until May 29, 1914, just prior to the 1914 general election. The majority party was the Ontario Conservative Party led by Sir James P. Whitney.
William Henry Hoyle served as speaker for the assembly.
| Riding | Member | Party |
| Addington | William David Black | Conservative |
| Algoma | Albert Grigg | Conservative |
| Brant | John Wesley Westbrook | Conservative |
| Brant South | Willoughby Staples Brewster | Conservative |
| Brockville | Albert Edward Donovan | Conservative |
| Bruce Centre | William MacDonald | Liberal |
| Bruce North | Charles Martin Bowman | Liberal |
| Bruce South | John Anderson | Liberal |
| Carleton | Robert Herbert McElroy | Conservative |
| Dufferin | Charles Robert McKeown | Conservative |
| Dundas | James Pliny Whitney | Conservative |
| Durham East | Josiah Johnston Preston | Conservative |
| Durham West | John Henry Devitt | Conservative |
| Elgin East | Charles Andrew Brower | Conservative |
| Elgin West | Findlay George MacDiarmid | Conservative |
| Essex North | Joseph Octave Reaume | Conservative |
| Essex South | Charles N. Anderson | Conservative |
| Fort William | Charles William Jarvis | Conservative |
| Frontenac | Anthony McGuin Rankin | Conservative |
| Glengarry | Hugh Munro | Liberal |
| Grenville | George Howard Ferguson | Conservative |
| Grey Centre | Isaac Benson Lucas | Conservative |
| Grey North | Alexander Grant MacKay | Liberal |
| Colin Stewart Cameron | Conservative | |
| Grey South | David Jamieson | Conservative |
| Haldimand | Christian Kohler | Liberal |
| Halton | Alfred Westland Nixon | Conservative |
| Hamilton East | Allan Studholme | Labour |
| Hamilton West | John Strathearn Hendrie | Conservative |
| Hastings East | Sandy Grant | Conservative |
| Hastings North | John Robert Cooke | Conservative |
| Hastings West | John Wesley Johnson | Conservative |
| Huron Centre | William Proudfoot | Liberal |
| Huron North | Armstrong Musgrove | Conservative |
| Huron South | Henry Eilber | Conservative |
| Kenora | Harold Arthur Clement Machin | Conservative |
| Kent East | Walter Renwick Ferguson | Liberal |
| Kent West | George William Sulman | Conservative |
| Kingston | Arthur Edward Ross | Conservative |
| Lambton East | Robert John McCormick | Liberal |
| Lambton West | William John Hanna | Conservative |
| Lanark North | Richard Franklin Preston | Conservative |
| Lanark South | Arthur James Matheson | Conservative |
| John Charles Ebbs | Conservative | |
| Leeds | John Robertson Dargavel | Conservative |
| Lennox | Thomas George Carscallen | Conservative |
| Lincoln | Elisha Jessop | Conservative |
| London | Adam Beck | Conservative |
| Manitoulin | Robert Roswell Gamey | Conservative |
| Middlesex East | Robert Sutherland | Liberal |
| George Wesley Neely | Conservative | |
| John McFarlane | Conservative | |
| Middlesex North | Duncan MacArthur | Conservative |
| Middlesex West | John Campbell Elliott | Liberal |
| Monck | Thomas A. Marshall | Liberal |
| Muskoka | Arthur Arnold Mahaffy | Conservative |
| Samuel Henry Armstrong | Conservative | |
| Nipissing | Henri Morel | Conservative |
| Norfolk North | Thomas Robert Atkinson | Liberal |
| Norfolk South | Arthur Clarence Pratt | Conservative |
| Northumberland East | Samuel Greerson Nesbitt | Conservative |
| Northumberland West | Samuel Clarke | Liberal |
| Ontario North | William Henry Hoyle | Conservative |
| Ontario South | William Edmund Newton Sinclair | Liberal |
| Ottawa East | Napoléon Champagne | Conservative |
| Ottawa West | James Albert Ellis | Conservative |
| Oxford North | Newton Wesley Rowell | Liberal |
| Oxford South | Thomas Richard Mayberry | Liberal |
| Parry Sound | John Galna | Conservative |
| Peel | Samuel Charters | Conservative |
| James Robinson Fallis | Conservative | |
| Perth North | James Torrance | Conservative |
| Perth South | John Benneweis | Conservative |
| Peterborough East | James Thompson | Conservative |
| Peterborough West | Edward Armour Peck | Conservative |
| Port Arthur | Donald McDonald Hogarth | Conservative |
| Prescott | Gustave Évanturel | Liberal |
| Prince Edward | Robert Addison Norman | Conservative |
| Rainy River | James Arthur Mathieu | Conservative-Liberal |
| Renfrew North | Edward Arunah Dunlop | Conservative |
| Renfrew South | Thomas William McGarry | Conservative |
| Russell | Damase Racine | Liberal |
| Sault Ste. Marie | William Howard Hearst | Conservative |
| Simcoe Centre | Alfred Burke Thompson | Conservative |
| Simcoe East | James Irwin Hartt | Conservative |
| Simcoe South | Alexander Ferguson | Conservative |
| Simcoe West | James Stoddart Duff | Conservative |
| Stormont | John Colborne Milligan | Conservative |
| Sturgeon Falls | Zotique Mageau | Liberal |
| Sudbury | Charles McCrea | Conservative |
| Timiskaming | Robert Taylor Shillington | Conservative |
| Toronto East - A | Robert Allan Pyne | Conservative |
| Toronto East - B | Thomas Richard Whiteside | Conservative |
| Toronto North - A | William Kirkpatrick McNaught | Conservative |
| Toronto North - B | James Joseph Foy | Conservative |
| Toronto South - A | Edward William James Owens | Conservative |
| Toronto South - B | George Horace Gooderham | Conservative |
| Toronto West - A | Thomas Crawford | Conservative |
| Toronto West - B | William David McPherson | Conservative |
| Victoria East | Robert Mercer Mason | Conservative |
| Victoria West | Adam Edward Vrooman | Conservative |
| Waterloo North | Henry George Lackner | Conservative |
| Charles Henry Mills | Conservative | |
| Waterloo South | George Pattinson | Conservative |
| Welland | Evan Eugene Fraser | Conservative |
| Wellington East | Udney Richardson | Liberal |
| Wellington South | Henry Scholfield | Conservative |
| Wellington West | William Clarke Chambers | Conservative |
| Wentworth North | James McQueen | Liberal |
| Wentworth South | James Thomas Hammill Regan | Conservative |
| York East | Alexander McCowan | Conservative |
| George Stewart Henry | Conservative | |
| York North | Thomas Herbert Lennox | Conservative |
| York West | Forbes Godfrey | Conservative |