Lambton—Kent—Middlesex (provincial electoral district)

Not to be confused with Lambton—Kent—Middlesex (federal electoral district).

Lambton—Kent—Middlesex is a provincial electoral district in southwestern Ontario, Canada. It elects one member to the Legislative Assembly of Ontario.

Lambton—Kent—Middlesex

Ontario electoral district
Provincial electoral district
Legislature	Legislative Assembly of Ontario
MPP	Steve Pinsonneault Progressive Conservative
District created	1999
First contested	1999
Last contested	2025
Demographics
Population (2016)	105,335
Electors (2018)	83,993
Area (km²)	5,708
Pop. density (per km²)	18.5
Census division(s)	Chatham-Kent, Lambton County, Middlesex County
Census subdivision(s)	Lambton Shores, Warwick, Brooke-Alvinston, Dawn-Euphemia, Southwest Middlesex, Newbury, Adelaide Metcalfe, Strathroy-Caradoc, Oneida 41, Chippewas of the Thames First Nation 42, Walpole Island 46, Chatham-Kent, North Middlesex, Lucan Biddulph, Middlesex Centre

It was created in 1999 from parts of Lambton, Chatham—Kent and Middlesex when ridings were redistributed to match their federal counterparts.

From 1999 to 2007 the riding consisted of the municipalities of Lambton Shores, Warwick, Brooke-Alvinston, Dawn-Euphemia, Southwest Middlesex, Newbury, Adelaide Metcalfe, Strathroy-Caradoc, Oneida 41, Chippewas of the Thames First Nation 42, Plympton-Wyoming, Enniskillen, Petrolia, Oil Springs, Walpole Island 46, Chatham-Kent north of the Thames River and not including the former city of Chatham, and the southwest third of North Middlesex.

In 2007, the riding was redistributed, and it lost Plympton-Wyoming, Enniskillen, Petrolia and Oil Springs while it gained the rest of North Middlesex, Lucan Biddulph and Middlesex Centre.

A rural riding by nature, the issues of gun control and abortion arise frequently during town-hall meetings and elections.

During the 1999 election, the riding attracted controversy as it included Ipperwash Provincial Park - the sight of a 1995 stand-off between the Ontario Provincial Police and native land protesters known as the Ipperwash Crisis. Political events in the riding became frequent targets for further protests by natives unhappy with the Conservative Government's handling of the Ipperwash Affair and the associated shooting death of protester Dudley George. Despite the controversy, Progressive Conservative MPP Marcel Beaubien was re-elected to the Legislative Assembly of Ontario, despite strong campaigns by Liberal former municipal politician Larry O'Neil and New Democratic candidate Jim Lee, then-President of United Automobile Workers Local 251.

Members of Provincial Parliament

This riding has elected the following members of the Legislative Assembly of Ontario:

Lambton—Kent—Middlesex
Assembly	Years	Member		Party
Riding created from Lambton, Chatham—Kent and Middlesex
37th	1999–2003		Marcel Beaubien	Progressive Conservative
38th	2003–2007		Maria Van Bommel	Liberal
39th	2007–2011
40th	2011–2014		Monte McNaughton	Progressive Conservative
41st	2014–2018
42nd	2018–2022
43rd	2022–2023
	2024–2025		Steve Pinsonneault
44th	2025–present

Election results

Winning party in each polling division of Lambton—Kent—Middlesex at the 2025 Ontario general election

2025 Ontario general election
** Preliminary results — Not yet official **
Party	Candidate	Votes	%	±%	Expenditures
	Progressive Conservative	Steve Pinsonneault	25,297	53.6	–3.3
	Liberal	Cathy Burghardt-Jesson	12,397	26.2	+3.4
	New Democratic	Kathryn Shailer	5,779	12.2	+1.4
	New Blue	Andy Fisher	2,093	4.4	–1.1
	Green	Andraena Tilgner	1,677	3.6	+1.9
Total valid votes/expense limit
Total rejected, unmarked, and declined ballots
Turnout			51.4	+21.1
Eligible voters			91,874
	Progressive Conservative hold		Swing		–3.4
Source: Elections Ontario[1]

Main article: 2024 Lambton—Kent—Middlesex provincial by-election

Ontario provincial by-election, May 2, 2024 Resignation of Monte McNaughton
Party	Candidate	Votes	%	±%
	Progressive Conservative	Steve Pinsonneault	15,656	56.80	-2.01
	Liberal	Cathy Burghardt-Jesson	6,289	22.82	+13.24
	New Democratic	Kathryn Shailer	2,978	10.80	-8.04
	New Blue	Keith Benn	1,515	5.50	-0.87
	Green	Andraena Tilgner	429	1.56	-2.42
	None of the Above	Stephen R. Campbell	360	1.31	+0.60
	Ontario Party	Cynthia Workman	250	0.91	-0.80
	Family Rights	Hilda Walton	87	0.32
Total valid votes			27,564
Total rejected ballots			87
Turnout				30.29	-17.08
Eligible voters			90,993
	Progressive Conservative hold		Swing		-7.46

Winning party in each polling division of Lambton—Kent—Middlesex at the 2022 Ontario general election

v t e 2022 Ontario general election
Party	Candidate	Votes	%	±%	Expenditures
	Progressive Conservative	Monte McNaughton	24,933	58.81	+3.46	$86,631
	New Democratic	Vanessa Benoit	7,987	18.84	−14.48	$66,308
	Liberal	Bruce Baker	4,063	9.58	+3.35	$0
	New Blue	David Barnwell	2,701	6.37		$3,090
	Green	Wanda Dickey	1,688	3.98	+0.69	$381
	Ontario Party	Aaron Istvan Vegh	727	1.71		$0
	None of the Above	Dean Eve	300	0.71		$283
Total valid votes/expense limit			42,399	99.41	+0.63	$126,309
Total rejected, unmarked, and declined ballots			253	0.59	-0.63
Turnout			42,652	47.28	−13.50
Eligible voters			90,109
	Progressive Conservative hold		Swing		+8.97
Source(s) "Summary of Valid Votes Cast for Each Candidate" (PDF). Elections Ontario. Archived from the original on 2023-05-18. "Statistical Summary by Electoral District" (PDF). Elections Ontario. Archived from the original on 2023-05-21.

2018 Ontario general election
Party	Candidate	Votes	%	±%
	Progressive Conservative	Monte McNaughton	27,906	55.34	+10.02
	New Democratic	Todd Case	16,800	33.32	+6.87
	Liberal	Mike Radan	3,143	6.23	-13.95
	Green	Anthony Li	1,660	3.29	-1.30
	Trillium	Brian Everaert	555	1.10
	Libertarian	Brad Greulich	360	0.71
Total valid votes			50,424	98.78
Total rejected, unmarked and declined ballots			622	1.22
Turnout			51,046	60.77
Eligible voters			83,993
	Progressive Conservative hold		Swing		+1.57
Source: Elections Ontario[2]

^ Results are compared to redistributed results

2014 general election redistributed results[3]
Party		Vote	%
	Progressive Conservative	20,514	45.32
	New Democratic	11,969	26.44
	Liberal	9,136	20.19
	Green	2,072	4.58
	Others	1,570	3.47

2014 Ontario general election
Party	Candidate	Votes	%	±%
	Progressive Conservative	Monte McNaughton	20,710	45.17	-0.56
	New Democratic	Joe Hill	12,160	26.52	+5.56
	Liberal	Mike Radan	9,298	20.28	-9.04
	Green	James Armstrong	2,104	4.59	+2.26
	Family Coalition	Marinus Vander Vloet	568	1.24	+0.41
	None of the Above	Bob Lewis	558	1.22	–
	Freedom	Dave Durnin	242	0.53	+0.25
	Libertarian	Matt Willson	207	0.45	–
Total valid votes			45,847	98.60
Total rejected, unmarked and declined ballots			653	1.40	+0.99
Turnout			46,500	56.93	+2.85
Eligible voters			81,678
	Progressive Conservative hold		Swing		-3.06
Source: Elections Ontario[4]

2011 Ontario general election
Party	Candidate	Votes	%	±%
	Progressive Conservative	Monte McNaughton	19,379	45.74	+9.43
	Liberal	Maria Van Bommel	12,423	29.32	-13.95
	New Democratic	Joe Hill	8,882	20.96	+10.23
	Green	James Armstrong	987	2.33	-5.57
	Family Coalition	Marinus Vander Vloet	350	0.83	-0.48
	Reform	Brad Harness	232	0.55	+0.05
	Freedom	Tom Jackson	119	0.28
Total valid votes			42,372	99.58
Total rejected, unmarked and declined ballots			177	0.42	-0.16
Turnout			42,549	54.08	-1.10
Eligible voters			78,683
	Progressive Conservative gain from Liberal		Swing		+11.69
Source: Elections Ontario[5]

2007 Ontario general election
Party	Candidate	Votes	%	±%
	Liberal	Maria Van Bommel	18,228	43.27	-1.39
	Progressive Conservative	Monte McNaughton	15,295	36.30	+0.63
	New Democratic	Joyce Jolliffe	4,520	10.73	-1.21
	Green	James Armstrong	3,329	7.90
	Family Coalition	Bill McMaster	549	1.30
	Reform	Brad Harness	209	0.50
Total valid votes			42,130	99.43
Total rejected, unmarked and declined ballots			243	0.57
Turnout			42,373	55.18
Eligible voters			76,790
	Liberal hold		Swing		-1.01

2003 general election redistributed results[6]
Party		Vote	%
	Liberal	17,804	44.65
	Progressive Conservative	14,223	35.67
	New Democratic	4,761	11.94
	Others	3,085	7.74

2003 Ontario general election
Party	Candidate	Votes	%	±%
	Liberal	Maria Van Bommel	18,533	45.11	+2.18
	Progressive Conservative	Marcel Beaubien	15,060	36.66	-8.34
	New Democratic	Joyce Jolliffe	4,523	11.01	+1.42
	Green	Tim Van Bodegom	1,133	2.76
	Independent	James Armstrong	1,053	2.56
	Freedom	Wayne Forbes	780	1.90	-0.58
Total valid votes			41,082	99.19
Total rejected, unmarked and declined ballots			336	0.81	-0.19
Turnout			41,418	59.75	-0.71
Eligible voters			69,314
	Liberal gain from Progressive Conservative		Swing		+5.26

1999 Ontario general election
Party	Candidate	Votes	%
	Progressive Conservative	Marcel Beaubien	19,561	45.00
	Liberal	Larry O'Neill	18,665	42.94
	New Democratic	Jim Lee	4,170	9.59
	Freedom	Wayne H. Forbes	1,076	2.48
Total valid votes			43,472	99.00
Total rejected, unmarked and declined ballots			440	1.00
Turnout			43,912	60.46
Eligible voters			72,630

2007 electoral reform referendum

2007 Ontario electoral reform referendum
Side		Votes	%
	First Past the Post	28,144	68.8
	Mixed member proportional	12,775	31.2
	Total valid votes	40,919	100.0