Mentiri is a mukim in the Brunei-Muara district of Brunei. It is located in the north-east of the Brunei-Muara district, facing the South China Sea to the north, Mukim Serasa to the east, the Brunei Bay to the south, Mukim Kota Batu to the south-west and Mukim Berakas 'A' and Mukim Berakas 'B' to the west.