Helensville was a New Zealand parliamentary electorate in the Auckland region, returning one Member of Parliament to the House of Representatives.

The seat was won and held by John Key through his term as prime minister.

Together with a northward shift of New Zealand's population, this resulted in five new electorates having to be created in the upper part of the North Island.

[4] Helensville was re-established in time for the 2002 election in response to continued high population growth in and around Auckland.

Helensville covers an area of the rapidly growing northern Auckland urban fringe, drawing Helensville and Kumeū from the former Rodney District, moving south to take in Paremoremo, Greenhithe and Albany from the former North Shore City, and finally tacking west to include Whenuapai, Hobsonville and West Harbour from the former Waitakere City.

Its northern boundary moved northward to become the same as the boundary between the Northland and Auckland local government regions, taking in part of the Northland electorate and all that part of Rodney electorate north of Waiwera, which is, by area, most of Rodney.

On the other hand, an area running from Dairy Flat south to Paremoremo moved into Rodney, which is renamed the Whangaparāoa electorate.

Newcomer John Key beat sitting Waitakere MP Brian Neeson to the National Party nomination and, in a tight year for his party, won the electorate by 1,705 votes in a split field when a disgruntled Neeson stood as an independent.

Yellow background denotes an electorate win by a list member, or other incumbent.

Yellow background denotes an electorate win by a list member, or other incumbent.

Yellow background denotes an electorate win by a list member, or other incumbent.