The future leader of the Labour Party will speak to their Tauranga members tonight - but the identity of the troubled party's next chief is yet to be decided.

Labour MPs Nanaia Mahuta, David Parker, Grant Robertson and Andrew Little will push their case for the leadership at Historic Village Hall, from 7.30pm as part of a month-long nationwide tour.

David Parker, Grant Robertson, Andrew Little, and Nanaia Mahuta are contesting the Labour Party leadership position. Photos: Supplied.

Former leader David Cunliffe's resignation on September 30 as the 14th leader of the party triggered a party-wide leadership election, the result of which will be announced on November 18.

David's resignation came after the National Party gained 47 per cent of the party vote and 60 of the 121 seats in the general election.

On election night counts, the party appeared to hold the first majority since 1994 with 61 seats, but lost one seat to the Green Party on the official count.

The Labour Party on the other hand, lost ground for the fourth election in a row, receiving 25.1 per cent of the party vote and 32 seats.

For deputy leader Grant Robertson, this is the second time in just over a year he will take to the stage in Tauranga for the leadership after he, Cunliffe and Shane Jones contested the leadership position last September.

David Parker was appointed acting leader by caucus a week after the election after Cunliffe stepped down.

The Labour Party has a preferential voting system for its leadership under which members, caucus and affiliates rank candidates in order of preference.

Party members and caucus get 40 per cent of voting power while affiliated unions receive the remaining 20 per cent.

In each round the lowest ranked candidate is knocked out and their supporters' second preference votes are tallied up until one candidate has more than 50 per cent.

Only Labour Party members can attend the meeting. If you are not already a member, you can join at the meeting so long as you are not a member of another political party and are aged 15 or above.

If you are a member and attending the meeting, you are required to bring along your membership card or receipt of membership to ease administration.

After tonight's meeting the quartet move to Hamilton before finishing up in Mangere on November 11.