The Māori Party and Hone Harawira's Mana Movement have formed a working group to broker a strategic relationship heading into next year's election.
Both parties suffered losses in 2014. Mr Harawira lost his seat in Te Tai Tokerau while the Māori Party lost two seats - all of which went to Labour.
"We consider this day historic in the sense that this is the first time the two executives of our parties have come together, and that bodes well for our future working relationship," Māori Party president Tukuroirangi Morgan said at the meeting on Wednesday.
Mr Morgan said it's important they learn from the lessons of the last election and move forward.
"It is a significant occasion where we have been able to put aside our differences and focus on what is best for our people."
Mana Party leader Hone Harawira and Mr Morgan met in July in an attempt to heal the five-year rift.
Mr Harawira quit the Māori Party in 2011 over its support agreement with National, and founded his own movement.
He resigned from Parliament, fought a by-election and won.
Tentative reconciliation attempts came to nothing and Mr Harawira lost the Te Tai Tokerau seat to Labour's Kelvin Davis in 2014.
Following Mr Morgan's first meeting with Mr Harawira, the Maori Party's co-leaders Te Ururoa Flavell and Marama Fox ruled out an alliance with Mana but said they were open to "a more cohesive relationship".
NZN / Newshub.