Mukim Liang is a mukim in Belait District, Brunei. The population was 14,301 in 2016.
The mukim is located in the north of the district, bordering the South China Sea to the north, Mukim Telisai in Tutong District to the north-east, Mukim Bukit Sawat to the south-east, Mukim Labi to the south and Mukim Seria to the west.
As of 2016 census, the population was 14,301 with males and females. The mukim had 2,607 households occupying 2,602 dwellings. Among the population, lived in urban areas, while the remainder of lived in rural areas.
As of 2021, the mukim comprised the following villages: