Thirteen Whanganui iwi members have been nominated. They are Kiritahi Firmin, Geoffrey Hipango, Tāwhiao McMaster, Stephanie Osborne, Soraya Peke-Mason, Hayden Potaka, Utiku Potaka, Elijah Pue, Tamahaia Skinner, Sunny Teki-Clark, Hayden Turoa, Siani Walker and Che Wilson.
While the election process itself is managed by Election Services, Ngā Tāngata Tiaki is caretaker of the Whanganui Iwi Register and whānau need to be registered first to vote.
Ngā Tāngata Tiaki data administrator Kimmy Ranginui said the election was carried out every three years and was a big undertaking for the trust.
"What we are doing is asking our people who should be the next wave of trustees for Ngā Tāngata Tiaki o Whanganui," Ranginui said.
"We have close to 8000 registered adult iwi members who are eligible to vote, and it is important that they have their say."
Ranginui said the trustees would have an important job ahead of them, as the trust continued to build its foundations and moved into a phase of normalisation.
"We are encouraging our people to make sure that they are registered on the Whanganui Iwi Register and that their details are correct, otherwise they won't be able to vote.
"The registration forms are also able to be completed online on our website, so please make sure you are signed up and able to participate."
Some registered members had moved addresses and had not notified the trust to update their records. Anyone who thought they were registered but had not received a voting pack needed to call the office, Ranginui said.
The election result will be known in early September.