Waiariki is a New Zealand parliamentary Māori electorate that was first established for the 1999 election. Since the 2005 election, it has been held by Te Ururoa Flavell MP.
The electorate includes the following population centres:
In the 2013/14 redistribution, a minor boundary adjustment was undertaken. A small area, including the village of Tuia, was transferred to Waiariki from the Ikaroa-Rāwhiti electorate.
The electorate includes the following tribal areas:
The electorate was created for the 1999 election. The first representative was Mita Ririnui of the Labour Party, with Tuariki Delamere (Te Tawharau) coming second, Arapeta Tahana (Alliance) coming third and Kahukore Baker (New Zealand First) coming fourth.
In the 2002 election, Ririnui was confirmed with 61.93% of the electorate vote. Rihi Vercoe and Hamuera Mitchell of Mana Māori and the National Party came second and third, respectively.
In the 2005 election, Ririnui was beaten by Te Ururoa Flavell of the Māori Party. Hawea Vercoe of Destiny New Zealand came a distant third. The 2008 election was contested by two contenders: the incumbent and Ririnui. Flavell was once again confirmed.