27th Parliament of Ontario
The 27th Legislative Assembly of Ontario was in session from September 25, 1963, until September 5, 1967, just prior to the 1967 general election. The majority party was the Ontario Progressive Conservative Party led by John Robarts.
Donald Hugo Morrow served as speaker for the assembly.
| Riding | Member | Party | Notes |
| Algoma—Manitoulin | Stanley William Farquhar | Liberal | |
| Armourdale | Gordon Carton | Progressive Conservative | |
| Beaches | Robert John Harris | Progressive Conservative | |
| Bellwoods | John Yaremko | Progressive Conservative | |
| Bracondale | Joseph M. Gould | Liberal | Died in 1965 |
| George Ben | Liberal | Elected in a by-election in 1965 | |
| Brant | Robert Fletcher Nixon | Liberal | |
| Brantford | George Thomas Gordon | Liberal | |
| Bruce | Ross MacKenzie Whicher | Liberal | |
| Carleton | William Erskine Johnston | Progressive Conservative | |
| Cochrane North | René Brunelle | Progressive Conservative | |
| Cochrane South | Wilf Spooner | Progressive Conservative | |
| Don Mills | Stanley John Randall | Progressive Conservative | |
| Dovercourt | Andy Thompson | Liberal | |
| Downsview | Vernon Milton Singer | Liberal | |
| Dufferin—Simcoe | Alfred Wallace Downer | Progressive Conservative | |
| Durham | Hugh Alex Carruthers | Progressive Conservative | |
| Eglinton | Leonard Mackenzie Reilly | Progressive Conservative | |
| Elgin | Ronald Keith McNeil | Progressive Conservative | |
| Essex North | Arthur John Reaume | Liberal | |
| Essex South | Donald Alexander Paterson | Liberal | |
| Etobicoke | Leonard A. Braithwaite | Liberal | |
| Forest Hill | Edward Arunah Dunlop | Progressive Conservative | |
| Fort William | Edward George Freeman | New Democratic Party | |
| Frontenac—Addington | John Richard Simonett | Progressive Conservative | |
| Glengarry | Osie Villeneuve | Progressive Conservative | |
| Grenville—Dundas | Frederick McIntosh Cass | Progressive Conservative | |
| Grey North | Edward Carson Sargent | Liberal | |
| Grey South | Farquhar Robert Oliver | Liberal | |
| Haldimand—Norfolk | James Noble Allan | Progressive Conservative | |
| Halton | George Albert Kerr | Progressive Conservative | |
| Hamilton Centre | Ada Mary Pritchard | Progressive Conservative | |
| Hamilton East | Norman Andrew Davison | New Democratic Party | |
| Hamilton—Wentworth | Thomas Ray Connell | Progressive Conservative | |
| Hastings East | Clarke Rollins | Progressive Conservative | |
| Hastings West | Elmer Sandercock | Progressive Conservative | |
| High Park | Alfred Hozack Cowling | Progressive Conservative | |
| Humber | William Beverley Lewis | Progressive Conservative | |
| Huron | Charles Steel MacNaughton | Progressive Conservative | |
| Huron—Bruce | Murray Gaunt | Liberal | |
| Kenora | Robert Wayne Gibson | Liberal-Labour | Died in 1966 |
| Leo Edward Bernier | Progressive Conservative | Elected in a by-election in 1966 | |
| Kent East | John Purvis Spence | Liberal | |
| Kent West | William Darcy McKeough | Progressive Conservative | |
| Kingston | Charles Joseph Sylvanus Apps | Progressive Conservative | |
| Lakeshore | Robert Alan Eagleson | Progressive Conservative | |
| Lambton East | Lorne Charles Henderson | Progressive Conservative | |
| Lambton West | John Ralph Knox | Progressive Conservative | |
| Lanark | George Ellis Gomme | Progressive Conservative | |
| Leeds | James Auld | Progressive Conservative | |
| Lincoln | Robert Stanley Welch | Progressive Conservative | |
| London North | John Parmenter Robarts | Progressive Conservative | |
| London South | John Howard White | Progressive Conservative | |
| Middlesex North | William Atcheson Stewart | Progressive Conservative | |
| Middlesex South | Neil Leverne Olde | Progressive Conservative | |
| Muskoka | Robert James Boyer | Progressive Conservative | |
| Niagara Falls | George Bukator | Liberal | |
| Nickel Belt | Gaston Joseph Clement Demers | Progressive Conservative | |
| Nipissing | Martin Leo Troy | Liberal | Died in 1965 |
| Richard Stanley Smith | Liberal | Elected in a by-election in 1965 | |
| Northumberland | Russell Daniel Rowe | Progressive Conservative | |
| Ontario | Matthew Bulloch Dymond | Progressive Conservative | |
| Oshawa | Albert V. Walker | Progressive Conservative | |
| Ottawa East | Horace S. Racine | Liberal | |
| Ottawa South | Irwin Haskett | Progressive Conservative | |
| Ottawa West | Donald Hugo Morrow | Progressive Conservative | |
| Oxford | Gordon William Pittock | Progressive Conservative | |
| Parkdale | James Beecham Trotter | Liberal | |
| Parry Sound | Allister Johnston | Progressive Conservative | |
| Peel | William Grenville Davis | Progressive Conservative | |
| Perth | James Frederick Edwards | Progressive Conservative | |
| Peterborough | Keith Roy Brown | Progressive Conservative | |
| Port Arthur | George Calvin Wardrope | Progressive Conservative | |
| Prescott | Louis-Pierre Cécile | Progressive Conservative | |
| Prince Edward—Lennox | Norris Eldon Howe Whitney | Progressive Conservative | |
| Rainy River | William George Noden | Progressive Conservative | |
| Renfrew North | Maurice Hamilton | Progressive Conservative | |
| Renfrew South | Paul Joseph Yakabuski | Progressive Conservative | |
| Riverdale | Robert William Macaulay | Progressive Conservative | |
| Jim Renwick | New Democratic Party | ||
| Russell | Albert Benjamin Rutter Lawrence | Progressive Conservative | |
| Sault Ste. Marie | Arthur Allison Wishart | Progressive Conservative | |
| Scarborough Centre | George Henry Peck | Progressive Conservative | |
| Scarborough East | Louis M. Hodgson | Progressive Conservative | |
| Scarborough North | Thomas Leonard Wells | Progressive Conservative | |
| Scarborough West | Stephen Henry Lewis | New Democratic Party | |
| Simcoe Centre | David Arthur Evans | Progressive Conservative | |
| Simcoe East | Lloyd Averall Letherby | Progressive Conservative | |
| St. Andrew | Allan Grossman | Progressive Conservative | |
| St. David | Henry James Price | Progressive Conservative | |
| St. George | Allan Frederick Lawrence | Progressive Conservative | |
| St. Patrick | Archibald Kelso Roberts | Progressive Conservative | |
| Stormont | Fernand Guindon | Progressive Conservative | |
| Sudbury | Elmer Walter Sopha | Liberal | |
| Timiskaming | Richard Allan Hugh Taylor | Liberal | |
| Victoria | Ronald Glen Hodgson | Progressive Conservative | |
| Waterloo North | Keith Elkington Butler | Progressive Conservative | |
| Waterloo South | Allan Edward Reuter | Progressive Conservative | |
| Welland | Ellis Price Morningstar | Progressive Conservative | |
| Wellington South | Harry A. Worton | Liberal | |
| Wellington—Dufferin | John Henry Haines Root | Progressive Conservative | |
| Wentworth | Donald William Ewen | Progressive Conservative | |
| Wentworth East | Reg Gisborn | New Democratic Party | |
| Windsor—Sandwich | Maurice Lucien Bélanger | Liberal | |
| Ivan Wilfred Thrasher | Progressive Conservative | ||
| Windsor—Walkerville | Bernard Newman | Liberal | |
| Woodbine | Kenneth Bryden | New Democratic Party | |
| York East | Hollis Edward Beckett | Progressive Conservative | |
| York North | Addison Alexander MacKenzie | Progressive Conservative | |
| York South | Donald Cameron MacDonald | New Democratic Party | |
| York West | Leslie Rowntree | Progressive Conservative | |
| Yorkview | Fred Matthews Young | New Democratic Party |