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Northumberland—Peterborough South
Ontario electoral district
	Northumberland-Peterborough South in relation to other electoral districts in Southern Ontario
Provincial electoral district
Legislature	Legislative Assembly of Ontario
MPP	David Piccini; Progressive Conservative
;
District created	2015
First contested	2018
Last contested	2022
Demographics
Population (2016)	112,415
Electors (2018)	94,504
Area (km²)	2,903
Pop. density (per km²)	38.7
Census division(s)	Durham, Northumberland, Peterborough County
Census subdivision(s)	Alnwick/Haldimand, Brighton, Clarington, Cobourg, Cramahe, Hamilton Township, Otonabee–South Monaghan, Peterborough, Port Hope, Trent Hills

Northumberland—Peterborough South is a provincial electoral district in Ontario, Canada. It elects one member to the Legislative Assembly of Ontario. The riding was created in 2015.^[1]

Members of Provincial Parliament

Northumberland—Peterborough South
Assembly	Years	Member		Party
Riding created from Northumberland—Quinte West, Durham, and Prince Edward—Hastings
42nd	2018–2022		David Piccini	Progressive Conservative
43rd	2022–present		David Piccini	Progressive Conservative

v t e 2022 Ontario general election
Party	Candidate	Votes	%	±%
	Progressive Conservative	David Piccini	26,419	50.93	+5.61
	Liberal	Jeff Kawzenuk	12,936	24.94	+0.77
	New Democratic	Kim McArthur-Jackson	6,806	13.12	−11.38
	Green	Lisa Francis	2,942	5.67	+1.14
	Ontario Party	Vanessa Head	1,598	3.08
	New Blue	Joshua Chalhoub	1,170	2.26
Total valid votes			51,871	100.0
Total rejected, unmarked, and declined ballots			258
Turnout			52,129	51.72
Eligible voters			99,034
	Progressive Conservative hold		Swing		+2.42
Source(s) "Summary of Valid Votes Cast for Each Candidate" (PDF). Elections Ontario. 2022. Archived from the original on 2023-05-18. "Statistical Summary by Electoral District" (PDF). Elections Ontario. 2022. Archived from the original on 2023-05-21.

v t e 2018 Ontario general election
Party	Candidate	Votes	%	±%
	Progressive Conservative	David Piccini	27,386	45.32	+9.78
	New Democratic	Jana Papuckoski	14,804	24.50	+6.03
	Liberal	Lou Rinaldi	14,603	24.17	-17.35
	Green	Jeff Wheeldon	2,740	4.53	+0.27
	Libertarian	John O'Keefe	425	0.70
	Trillium	Derek Sharp	278	0.46
	Stop Climate Change	Paul Cragg	187	0.31
Total valid votes			60,423	100.0
	Progressive Conservative pickup new district.
Source: Elections Ontario^[2]

^ "Ontario's Liberal government adds 15 new ridings, bringing total to 122". CBC. Canadian Press. December 2, 2015. Retrieved August 5, 2017.
^ "Summary of Valid Votes Cast for each Candidate" (PDF). Elections Ontario. p. 8. Retrieved 20 January 2019.