Waitākere City was a territorial authority in the western part of the urban area of Auckland, New Zealand; it was governed by the Waitākere City Council from 1989 to 2010. It was New Zealand's fifth largest city, with an annual growth of about 2%. In 2010 the council was amalgamated with the other authorities of the Auckland Region to form the current Auckland Council.
The name "Waitākere" comes from the Waitākere River in the Waitākere Ranges.