Chief District Court Judge Jan-Marie Doogue said the move is an historic change in the district court process.
"We wanted a practical way for District Courts to recognise te reo Maori as an official language of New Zealand."
There was already a significant amount of te reo Maori being used in everyday language in Government agencies and other courts including the Maori Land Court, Waitangi Tribunal ad Rangitahi Youth Court and Matariki Court, she said.
"It would enhance proceedings and show appreciation for the cultural significance of the language in the court environment," Judge Doogue said.
The introduction of the initiative has been timed to coincide with Maori Language Week, which celebrates te reo Maori as a unique feature of the New Zealand identity and to encourage new ways of promoting the use of the language.
Ministry of Justice district courts manager Tony Fisher said a language training programme had been "a great opportunity for staff to connect with New Zealand's cultural heritage".