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Selwyn — New Zealand Election Results

Compiled by EveryElectionResult.com's data team · Last updated 2026-08-30

Selwyn was won by National Party at the 2023 general election, with a margin of 19,782 votes over Labour Party in the electorate vote. This page covers every general election in Selwyn from 2008 to 2023.

New Zealand uses Mixed-Member Proportional (MMP) voting: every voter casts two votes each election. The electorate vote below elects this seat's local MP by simple plurality (the same "winner by margin" model this site uses everywhere) — it does not by itself determine how many seats a party holds in Parliament. The separate party vote, shown further down, is what decides each party's overall share of Parliament, and often goes to a different party than the local electorate vote does.

Electorate Vote — Full History, 2008–2023

Election Winner Party Votes Vote Share Runner-up Margin
2008 National Party National Party 21,836 60.5% Labour Party (10,761) 11,075 (30.7 pts)
2011 National Party National Party 24,963 69.1% Labour Party (5,512) 19,451 (53.9 pts)
2014 National Party National Party 24,625 70.0% Green Party (4,064) 20,561 (58.4 pts)
2017 National Party National Party 28,686 66.2% Labour Party (9,047) 19,639 (45.3 pts)
2020 National Party National Party 20,986 49.6% Labour Party (16,018) 4,968 (11.7 pts)
2023 National Party National Party 31,504 66.2% Labour Party (11,722) 19,782 (41.6 pts)

Party Vote in Selwyn

The party vote is cast on the same ballot but decides Parliament's overall makeup, not this seat's MP. Shown here for the same years as the electorate vote above, so the two can be compared directly.

ElectionParty Vote WinnerVotesShareSame as electorate vote?
2008 National Party 20,141 54.9% Yes
2011 National Party 23,086 62.6% Yes
2014 National Party 22,809 63.6% Yes
2017 National Party 26,003 59.1% Yes
2020 Labour Party 18,102 42.1% No -- split result
2023 National Party 23,959 49.4% Yes

Full Result Breakdown by Election

2008

PartyVotesShare
National Party21,83660.5%
Labour Party10,76129.8%
Other1,3923.9%
Jim Anderton's Progressive1,3163.6%
ACT Party5391.5%
United Future2530.7%

2011

PartyVotesShare
National Party24,96369.1%
Labour Party5,51215.3%
Green Party3,67410.2%
NZ First1,2773.5%
Other6771.9%

2014

PartyVotesShare
National Party24,62570.0%
Green Party4,06411.5%
Labour Party3,83510.9%
NZ First1,8415.2%
Other6191.8%
Maori Party1290.4%
ACT Party830.2%

2017

PartyVotesShare
National Party28,68666.2%
Labour Party9,04720.9%
Green Party2,7726.4%
NZ First1,3453.1%
Other1,2702.9%
ACT Party1980.5%

2020

PartyVotesShare
National Party20,98649.6%
Labour Party16,01837.8%
ACT Party1,8904.5%
Green Party1,7494.1%
Other1,7084.0%

2023

PartyVotesShare
National Party31,50466.2%
Labour Party11,72224.6%
ACT Party2,8225.9%
Other1,5283.2%

Margin Over Time

Electorate-vote winning margin (percentage points) at each election, coloured by the winning party.

2008: National Party margin 30.7 pts 2011: National Party margin 53.9 pts 2014: National Party margin 58.4 pts 2017: National Party margin 45.3 pts 2020: National Party margin 11.7 pts 2023: National Party margin 41.6 pts 2008 2011 2014 2017 2020 2023

Trend

Selwyn has been contested at 6 general elections on record since 2008. Winning party of the electorate vote over that span: National Party.

Frequently Asked Questions

Who won Selwyn in the 2023 general election?

National Party won the Selwyn electorate vote in 2023 with 31,504 votes (66.2%), a margin of 19,782 votes over Labour Party in second place.

Did the electorate vote and party vote agree in Selwyn in 2023?

Yes -- National Party won both the electorate vote and the party vote in Selwyn in 2023.

Which parties have won the Selwyn electorate seat since 2008?

Since 2008, Selwyn has been won by: National Party.

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