This is a list of members of the Ontario Co-operative Commonwealth Federation (CCF) and its successor, the Ontario New Democratic Party (NDP), social democratic political parties in Ontario, Canada.

Current and former CCF/NDP members of the Ontario legislature

First elected in 1934

The CCF won one of the 90 seats available in the Legislative Assembly of Ontario in the 1934 provincial election:

List of Ontario CCF/NDP members

Samuel Lawrence; Hamilton East elected 1934, def. 1937, Mayor of Hamilton 1944-1949

List of Ontario CCF/NDP members

In the 1937 election no CCFers were elected.

List of Ontario CCF/NDP members

First elected in 1943

The CCF won 34 of the 90 seats available in the 1943 election:

Rae Luckock; Bracondale (Oakwood, Toronto) 1943-1945; 1st (tied with Macphail) woman elected to Ontario Legislature Charles Strange; Brantford 1943-1945 John Kehoe; Cochrane North 1943-1945 Bill Grummett; Cochrane South 1943-1945-1948-1951-1955 Arthur Nelson Alles; Essex North 1943-1945 (resigned from CCF caucus in 1945 to sit as Independent Labour, did not run in 1945) Robert Thornberry; Hamilton Centre 1943-1945, 1948–1951 Frederick Wilson Warren; Hamilton-Wentworth 1943-1945 Garfield Anderson; Fort William 1943—1945-1948 William Herbert Connor; Hamilton East 1943-1945 William Docker; Kenora 1943-1945-1948 Harry Steel; Lambton West 1943-1945 Cyril Overall; Niagara Falls 1943-1945 Arthur Casselman; Nipissing 1943-1945 Arthur Henry Williams; Ontario (Durham) 1943-1945 Elmer Smith; Parry Sound 1943-1945 Frederick Oliver Robinson; Port Arthur 1943-1945-1948-1951 George Edward Lockhart; Rainy River 1943-1945 Leslie Wismer; Riverdale 1943-1945, 1948–1951 William Dennison; St. David 1943-1945, 1948–1951 George Isaac Harvey; Sault Ste Marie 1943-1945-1948-1951 Robert Carlin; Sudbury 1943-1945-1948 Calvin Taylor; Timiskaming 1943-1945-1948-1951 John Henry Cook; Waterloo North 1943-1945 Grieve Robinson; Waterloo South 1943-1945 Howard Elis Brown; Welland 1943-1945 Leslie Hancock; Wellington South 1943-1945 (resigned from CCF caucus in 1944 to sit as Independent Farmer-Labour, did not run in 1945) William Robertson; Wentworth 1943-1945-1948 George Bennett; Windsor Sandwich 1943-1945 William Riggs; Windsor Walkerville 1943-1945 Bertram Leavens; Woodbine 1943-1945, 1948–1951 Agnes Campbell Macphail; York East (East York) 1943-1945 (defeated), 1948–1951 (defeated) first female MPP sworn in, tied with Luckock as first woman elected to legislature George Herbert Mitchell; York North 1943-1945 Ted Jolliffe; York South 1943-1945, 1948–1951 (CCF leader, 1942-1953) Charles Millard; York West 1943-1945, 1948–1951

First elected in 1945

The CCF won 8 of the 90 seats available in the 1945 election:

First elected in 1948

The CCF won 21 of the 90 seats available in the 1948 election: Reid Scott; Beaches 1948-1951, later NDP MP Harry Walters; Bracondale (Oakwood) 1948-1951 George Eamon Park; Dovercourt 1948-1951 Gordon Bennett Ellis; Essex North 1948-1951 John Dowling; Hamilton East 1948-1951 William Temple; High Park 1948-1951 T.D. Thomas; Ontario (Durham) 1948-1951-1955, Oshawa 1955-1959-1963 Lloyd Fell; Parkdale 1948-1951 Theodore Isley; Waterloo South 1948-1951 Joseph Lees Easton; Wentworth 1948-1951

First elected in 1951

The CCF won two of the 90 seats available in the 1951 election:

First elected in 1955

The CCF won 3 of the 90 seats available in the 1955 election: Reg Gisborn; Wentworth East 1955-1959-1963-1967, Hamilton East 1967-1971-1975 (retired, NDP won) Donald Cameron MacDonald; York South 1955-1959-1963-1967-1971-1975-1977-1981-1982by (gave up seat for Bob Rae, NDP won) (CCF/NDP leader, 1953-1970)

First elected in 1959

The CCF won five of the 98 seats available in the 1959 election: Norman Andrew Davison; Hamilton East 1959-1963-1967, Hamilton Centre 1967-1971-1975 Kenneth Bryden; Woodbine 1959-1963-1967 (retired, NDP won)

First elected in 1963

The NDP won 7 of the 108 seats available in the 1963 election: Stephen Lewis; Scarborough West 1963-1967-1971-1975-1977-1978by (retired, NDP won) (NDP leader, 1970-1978) Fred Young; Yorkview (North York) 1963-1967-1971-1975-1977-1981, United Church Minister, former North York Alderman

First elected in 1964

The NDP won a seat available in a 1964 by-election: Jim Renwick; lawyer; Riverdale 1964by-1967-1971-1975-1977-1981-1984 (died in 1984, NDP won)

First elected in 1967

The NDP won 20 of the 117 seats available in the 1967 election: