A mukim is a second-level administrative division of Brunei Darussalam, and the primary sub-division of a larger district . There are thirty-nine mukims within the four districts of the sultanate Brunei Darussalam. A mukim is led by a, since 2015 elected by democratic vote. A mukim encompasses a number of villages, known in Malay as or . Mukims are administered by the district office of the district where they are located.
| Berakas 'A' | Brunei-Muara[2] | 28,311 | (note that Gadong 'A' and 'B' are shown as one entity) |
| Berakas 'B' | 39,284 | ||
| Burong Pingai Ayer | 1,459 | ||
| Gadong 'A' | 35,424 | ||
| Gadong 'B' | 38,067 | ||
| Kianggeh | 8,102 | ||
| Kilanas | 24,981 | ||
| Kota Batu | 12,676 | ||
| Lumapas | 8,058 | ||
| Mentiri | 39,324 | ||
| Pangkalan Batu | 15,860 | ||
| Peramu | 1,151 | ||
| Saba | 827 | ||
| Sengkurong | 40,972 | ||
| Serasa | 18,569 | ||
| Sungai Kebun | 4,282 | ||
| Sungai Kedayan | 241 | ||
| Tamoi | 942 | ||
| Bukit Sawat | Belait[3] | 759 | |
| Kuala Balai | 16 | ||
| Kuala Belait | 28,793 | ||
| Labi | 727 | ||
| Liang | 16,813 | ||
| Melilas | 29 | ||
| Seria | 18,313 | ||
| Sukang | 81 | ||
| Keriam | Tutong[4] | 8,589 | |
| Kiudang | 5,063 | ||
| Lamunin | 3,641 | ||
| Pekan Tutong | 9,883 | ||
| Rambai | 980 | ||
| Tanjong Maya | 3,772 | ||
| Telisai | 13,253 | ||
| Ukong | 2,029 | ||
| Amo | Temburong[5] | 1,667 | |
| Bangar | 2,112 | ||
| Batu Apoi | 1,355 | ||
| Bokok | 3,812 | ||
| Labu | 508 |