Tainui was a New Zealand parliamentary Māori electorate that existed between 2002 and 2008. It replaced the Hauraki electorate and absorbed a significant part of northern Te Tai Hauāuru. From the 2008 election it was replaced by the Hauraki-Waikato electorate.
The seat was held by Nanaia Mahuta of the Labour Party for the entirety of its existence from 2002 to 2008.[1]