The High Court has ruled that Tukoroirangi Morgan remains the chair of the Waikato-Tainui executive.
The head of the parliament, Tania Martin, and Mr Morgan have been at loggerheads - publicly disagreeing about a parliament vote to expel him last month.
Mr Morgan has maintained he has not been dropped because the vote was invalid, but Mrs Martin said previously that a sufficient majority of votes had disqualified him.
Mr Morgan took legal action against Mrs Martin and the parliament.
Last week, the High Court in Hamilton ruled the vote to expel Mr Morgan was insufficient.
The ruling means he remains as chair of the Waikato Tainui executive.