The board of directors of Tata Motors on Thursday announced the appointment of Mistry as the chairman of the board with effect from December 28, on the retirement of Ratan N Tata, the company said in a statement.
The board also conferred on Tata the honorary title of chairman emeritus, it added.
Earlier, Mistry was inducted into the companys board as the deputy chairman. Mistry has been a director of Tata Sons since 2006 and was appointed deputy chairman last November.
Last month, Tata had stepped down as chairman of Tata Global Beverages, making way for successor Mistry, who was inducted into the board of Indian Hotels Company. Mistry was also appointed as the deputy chairman of Tata Steel and Tata Chemicals. Tata Consultancy Services had also inducted him as deputy chairman.