The recommendation is made in a critical report on the Crown's involvement in the management of the Maori Wardens.
After backing a Maori Council claim, the Waitangi Tribunal said it had been struck by the change in Maori representation.
The council is the only nationwide Maori organisation recognised by law, but the Tribunal says its work intersects with that of other institutions, such as the Maori Women's Welfare League, the Iwi Chairs Forum, and urban authorities.
The tribunal said a conversation was needed between all of the institutions over setting up one national Maori organisation.
Council co-chair Sir Eddie Taihakurei Durie agreed there needed to be a stronger united voice.