The announcement follows the Foreign Minister's recent 17-day world trip, which included discussions about "deepening links" between Māori and Canada's indigenous peoples.
"This arrangement is an important step towards harnessing the unique potential of indigenous peoples and creating connections amongst these communities," Mahuta said.
Economies who join the initiative will commit to supporting "critical areas of importance to indigenous people". These include "growing economic prosperity and preserving Indigenous values and cultural knowledge".
O'Connor added that the initiative would "unlock" indigenous potential.
"Indigenous peoples have a long and rich history of trading and commerce, which this arrangement will build upon," he said.
"Unlocking the economic potential of indigenous economies to enable more effective trade and addressing some of the key challenges that indigenous peoples face, will be a focus of the IPETCA."