Mukim Pekan Tutong is a mukim in Tutong District, Brunei. The population was 9,883 in 2021. It encompasses Pekan Tutong, the district's sole town and administrative centre.

The mukim is located in the north-west of Tutong District, bordering the South China Sea to the north-west, Mukim Keriam to the east, Mukim Kiudang to the south-east, Mukim Tanjong Maya to the south and Mukim Telisai to the south-west.^{[citation needed]}

The Tutong River runs its course through the mukim and flows out into South China Sea. There are a few islands along the river, among them the islets of Setawat (Pulau Setawat) and Bakuku (Pulau Bakuku).

As of 2021 census,^[1] the population was 9,883 with 52.7% males and 47.3% females. The mukim had 1,991 households occupying 1,875 dwellings. The mukim is predominantly urban; 85.9% lived in urban areas in contrast to 14.1% in rural areas.

As of 2021, the mukim comprised the following census villages^[1]:

The municipal area of Pekan Tutong encompasses parts of Bukit Bendera and Kampong Petani.^{[citation needed]}