Kuala Belait, officially known as Kuala Belait Town, is the administrative town of the Belait District in Brunei. Located in the westernmost part of the country near the mouth of the Belait River, it serves as a significant municipal area and settlement under the mukim of the same name.
The town is situated approximately 85 kilometres west of the national capital, Bandar Seri Begawan, and 20 kilometres west of Seria, which is another town within the district. As of 2021, the population of the town proper was recorded at 4,544 residents.