The Green Party is to contest the by-election in the Maori seat of Ikaroa Rawhiti, left vacant after the death of Labour MP Parekura Horomia.
Greens co-leader Metiria Turei says the party has attracted a great deal of support from Maori over the years and it wants to give voters in Ikaroa-Rawhiti a real choice.
She says a candidate selection meeting will be held on Friday.
The Maori Party has selected Na Raihania as its candidate, and the Mana Party will announce its candidate on Wednesday.
Labour will make its decision on Sunday between four people bidding for the candidacy. They are Hayden Hape, Henare O'Keefe, Meka Whaitiri and Shane Taurima.
The by-election will be held on 29 June.